干旱区荒漠绿洲过渡带建植梭梭（ Haloxylon ammodendron ）林后土壤线虫群落演变

doi:10.7522/j.issn.1000-694X.2023.00091

摘要/Abstract

摘要：

荒漠绿洲过渡带人工固沙梭梭（Haloxylon ammodendron）林生长发育过程中，土壤生物多样性的演变研究是认识干旱区植物-土壤相互作用的重要内容。在河西走廊中段临泽绿洲边缘选择不同栽植时间序列（0、3、6、11、19、28、46 a）的固沙梭梭林，取冠层下和冠层外的表层土样（0~10 cm），研究固沙梭梭林建立后土壤线虫群落组成和多样性变化，探究线虫群落对植被-土壤系统恢复的指示作用。结果表明：在研究区共发现15个属，Eucephalobus和Acrobeloides为优势属，食细菌线虫（BF）为优势营养类群，占线虫总数50.3%~94.1%。梭梭生长显著提高土壤线虫总数、食细菌线虫丰度和线虫多样性。线虫富集指数（EI）和结构指数（SI）均小于50，土壤食物网随梭梭种植年限增加先稳定后逐渐退化。冗余分析表明，土壤化学性质变化（电导率EC、C/N和土壤有机碳SOC）显著影响线虫群落分布，EC对线虫属总变异解释率最高（32.7%）。土壤线虫作为生物指标揭示了植被-土壤生态系统的演变过程。

关键词: 固沙梭梭（Haloxylon ammodendron）林, 固沙年限, 土壤线虫群落, 多样性, 绿洲边缘

Abstract:

Study on the evolution of soil biodiversity during the growth of sand-fixing Haloxylon ammodendron in desert-oasis ecotone is an important part of understanding the plant-soil interaction in arid areas. Diffserent ages （0-， 3-， 6-， 11-， 19-， 28- and 46-years） of H. ammodendron plantations in Linze desert-oasis ecotone of northwestern China were selected and surface soil （0-10 cm） under and outside the canopy were sampled， to study the changes in the composition and diversity of nematode community after sand-fixing H. ammodendron establishment， and to explore the indicator effect of nematode community on plant-soil system restoration. In this study， a total of 15 genera were identified， Eucephalobus and Acrobeloides were the dominant genera. Bacterial nematodes were the dominant trophic group， accounting for 50.3%-94.1% of nematode numbers. The growth of H. ammodendron significantly increased the total number of soil nematodes， bacterial feeding nematodes and nematode diversity. Nematode enrichment index （EI） and structure index （SI） were less than 50. The soil food web was stable first and then degraded gradually with plantation ages. Redundancy analysis （RDA） indicated that changes in soil chemical properties （EC， C/N， and SOC） signi?cantly affected the distribution of nematode communities， and EC had the highest explanation rate for the total variation of nematode genera （32.7%）. Soil nematode as a biological indicator reveals the evolution process of the plant-soil ecosystem.

Key words: sand-fixing Haloxylon ammodendron plantation, sand-fixation year, soil nematode community, diversity, edge of oasis

中图分类号:

S154

安芳娇, 苏永中, 牛子儒, 刘婷娜. 干旱区荒漠绿洲过渡带建植梭梭（ Haloxylon ammodendron ）林后土壤线虫群落演变[J]. 中国沙漠, 2024, 44(2): 133-142.

Fangjiao An, Yongzhong Su, Ziru Niu, Tingna Liu. Evolution of soil nematode community after establishment of Haloxylon ammodendron plantations in an arid desert-oasis ecotone[J]. Journal of Desert Research, 2024, 44(2): 133-142.

图/表 10

参考文献 35

1	Neher D A.Ecology of plant and free-living nematodes in natural and agricultural soil［J］.Annual Review of Phytopathology，2010，48：371-394.
2	Yeates G W.Nematodes as soil indicators： functional and biodiversity aspects［J］.Biology and Fertility of Soils，2003，37：199-210.
3	Zhao J， Wang F M， Li J，et al.Effects of experimental nitrogen and/or phosphorus additions on soil nematode communities in a secondary tropical forest［J］.Soil Biology and Biochemistry，2014，75：1-10.
4	Alan K， Raquel C H， Sara Sánchez-Moreno，et al.The abundance，diversity，and metabolic footprint of soil nematodes is highest in high elevation alpine grasslands［J］.Frontiers in Ecology and Evolution，2016，4：1-12.
5	Zhang X K， Liang W J， Jiang D M，et al.Soil nematode community structure in a Chinese sand dune system［J］.Helminthologia，2007，44：204-209.
6	Klass J R， Peters D P C， Trohan J M，et al.Nematodes as an indicator of plant-soil interactions associated with desertification［J］.Applied Soil Ecology，2012，58：66-77.
7	Zhi D J， Nan W B， Ding X X，et al.Soil nematode community succession in stabilized sand dunes in the Tengger Desert，China［J］.Australian Journal of Soil Research，2009，47：508-517.
8	Guan P T， Zhang X K， Yu J，et al.Variation of soil nematode community composition with increasing sand-fixation year of Caragana microphylla：bioindication for desertification restoration［J］.Ecological Engineering，2015，81：93-101.
9	Yudai Kitagami， Toko Tanikawa， Yosuke Matsuda.Effects of microhabitats and soil conditions on structuring patterns of nematode communities in Japanese cedar （Cryptomeria japonica） plantation forests under temperate climate conditions［J］.Soil Biology and Biochemistry，2020，151（1）.
10	Peter Salamún， Vladimíra Hanzelová， Dana Miklisová，et al.The effects of vegetation cover on soil nematode communities in various biotopes disturbed by industrial emissions［J］.Science of the Total Environment，2017，592：106-114.
11	Su Y Z， Zhao W Z， Su P X，et al.Ecological effects of desertification control and desertified land reclamation in an oasis-desert ecotone in an arid region：a case study in Hexi Corridor， Northwest China［J］.Ecological Engineering， 2007， 29： 117-124 .
12	Liu J L， Wang Y G， Yang X H，et al.Genetic variation in seed and seedling traits of six Haloxylon ammodendron shrub provenances in desert areas of China［J］.Agroforestry Systems，2011，81：135-146.
13	Zhang K， Su Y Z， Liu T N，et al.Leaf C∶N∶P stoichiometrical and morphological traits of Haloxylon ammodendron over plantation age sequences in an oasis-desert ecotone in North China［J］.Ecological Research，2016，31：449-457.
14	Zhang K， Su Y Z， Wang T，et al.Soil properties and herbaceous characteristics in an age sequence of Haloxylon ammodendron plantations in an oasis-desert ecotone of northwestern China［J］.Journal of Arid Land，2016，8：960-972.
15	Yu K L， Wang G H.Long-term impacts of shrub plantations in a desert-oasis ecotone： accumulation of soil nutrients， salinity and development of herbaceour layer［J］.Land Degradation and Development，2018，29：2681-2693.
16	Zhu Y J， Jia Z Q.Soil water utilization characteristics of Haloxylon ammodendron plantation with different age during summer［J］.Acta Ecologica Sinica，2011，31（6）：341-346.
17	吉小敏，宁虎森，梁继业，等.不同水分条件下梭梭和多花柽柳苗期光合特性及抗旱性比较［J］.中国沙漠，2012，32（2）：399-406.
18	Cao Y F， Li Y， Li C H，et al.Relationship between presence of the desert shrub Haloxylon ammodendron and microbial communities in two soils with contrasting textures［J］.Applied Soil Ecology，2016，103：93-100.
19	鲍士旦.土壤农化分析［M］.北京：中国农业出版社，2000.
20	Yeates G W， Bongers T， De Goede R G，et al.Feeding habits in soil nematode families and genera-an outline for soil ecologists［J］.Journal of Nematology，1993，25：315-331.
21	Mulder C， Schouten A J， Hund-Rinke K，et al.The use of nematodes in ecological soil classification and assessment concepts［J］.Ecotoxicology and Environmental Safety，2005，62：278-289.
22	Ferris H， Bongers T， de Goede R G M.A framework for soil food web diagnostics： extension of the nematode faunal analysis concept［J］.Applied Soil Ecology，2001，18（1）：13-29.
23	苏永中，刘婷娜.流动沙地建植人工固沙梭梭林的土壤演变过程［J］.土壤学报，2020，57（1）：84-91.
24	Pen-Mouratov S， Rakhimbaev M， Steinberger Y.Seasonal and spatial variation in nematode communities in a Negev Desert Ecosystem［J］.Journal of Nematology，2003，35：157-166.
25	Zhi D， Li H， Nan W.Nematode communities in the artificially vegetated belt with or without irrigation in the Tengger Desert， China［J］.European Journal of Soil Biology，2008，44：238-246.
26	Wei C Z， Zheng H F， Li Q，et al.Nitrogen addition regulates soil nematode community composition through ammonium suppression［J］.PLoS One，2012，7（8）.
27	Yuan B， Li Z， Liu H，et al.Microbial biomass and activity in salt affected soils under and conditions［J］.Applied Soil Ecology，2007，35：319-328.
28	Su Y Z， Wang X F， Yang R，et al.Soil fertility，salinity and nematode diversity influenced by Tamarix ramosissima in different habitats in an arid desert oasis［J］.Environmental Management，2012，50：226-236.
29	Rousk J， Brookes P C， Bååth E.Contrasting soil pH effects on fungal and bacterial growth suggest functional redundancy in carbon mineralization［J］.Applied and Environmental Microbiology，2009，75（6）：1589-1596.
30	王雪峰，苏永中，杨荣.黑河中游绿洲不同开垦年限农田土壤线虫群落特征［J］.应用生态学报，2010，21（8）：2125-2131.
31	Viketoft M， Palmborg C， Sohlenius B，et al.Plant species effects on soil nematode communities in experimental grasslands［J］.Applied Soil Ecology，2005，30：90-103.
32	贾慧，王晟强，郑子成，等.植茶年限对土壤团聚体线虫群落结构的影响［J］.生态学报，2020，40（6）：2130-2140.
33	Bastow J L.Resource quality in a soil food web［J］.Biology and Fertility of Soils，2012，48：501-510.
34	De Deyn G B， Raaijmakers C E， van Ruijven J，et al.Plant species identity and diversity effects on different trophic levels of nematodes in the soil food web［J］.Oikos，2004，106：576-586.
35	周立峰，杨荣，赵文智.荒漠人工固沙植被区土壤结皮斥水性发展特征［J］.中国沙漠，2020，40（3）：185-192.

种植年限/a	pH		电导率EC/（μS·cm^-1）		全碳TC/（g·kg^-1）		全氮TN/（g·kg^-1）		全磷TP/（g·kg^-1）
种植年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	9.28±0.16^Ac	9.28±0.16^Aa	130.27±3.93^Ae	130.27±3.93^Ac	4.98±0.11^Ad	4.98±0.11^Ac	0.28±0.04^Ac	0.28±0.04^Ac	0.46±0.02^Ad	0.46±0.02^Ac
3	10.05±0.13^Aab	9.41±0.08^Ba	306.00±10.39^Ade	130.00±5.20^Bc	5.32±0.03^Ad	5.13±0.20^Abc	0.22±0.00^Ad	0.19±0.01^Ad	0.49±0.01^Acd	0.47±0.01^Ac
6	10.08±0.02^Aab	9.59±0.25^Ba	438.00±91.39^Acd	202.27±68.49^Bbc	6.96±0.53^Ac	6.28±0.19^Ab	0.30±0.01^Ac	0.21±0.02^Ad	0.56±0.02^Acd	0.53±0.04^Abc
11	10.03±0.05^Aab	9.61±0.21^Ba	522.00±100.64^Ac	231.00±51.10^Bab	7.40±0.16^Abc	6.32±0.50^Ab	0.38±0.03^Ab	0.28±0.02^Ac	0.57±0.00^Ac	0.54±0.03^Abc
19	10.09±0.01^Aa	9.57±0.37^Ba	713.67±96.26^Abc	253.10±15.53^Bab	8.43±0.88^Aab	7.63±0.92^Aa	0.38±0.01^Ab	0.33±0.00^Abc	0.68±0.07^Aab	0.65±0.08^Aa
28	9.87±0.20^Ab	9.59±0.23^Ba	721.00±71.34^Ab	287.63±104.60^Bab	8.72±1.65^Aa	7.87±1.34^Aa	0.52±0.01^Aa	0.39±0.07^Aa	0.67±0.08^Aabc	0.64±0.08^Aa
46	9.98±0.12^Aab	9.47±0.15^Ba	987.00±227.66^Aa	321.67±45.01^Ba	9.64±0.23^Aa	8.29±0.78^Aa	0.52±0.03^Aa	0.38±0.02^Aab	0.70±0.10^Aa	0.63±0.06^Aab
年限	***	ns	***	*	***	***	***	***	***	*
位置	***		***		ns		ns		ns
年限×位置	***		***		ns		ns		ns
种植年限/a	土壤有机碳SOC/（g·kg^-1）		碳氮比C/N		速效氮AN/（mg·kg^-1）		速效磷AP/（mg·kg^-1）		速效钾AK/（mg·kg^-1）
种植年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	0.35±0.03^Ad	0.35±0.03^Ad	1.29±0.11^Ad	1.29±0.11^Ac	25.38±2.13^Ab	25.38±2.13^Abc	2.33±0.29^Ac	2.33±0.29^Ad	103.33±5.77^Ad	103.33±5.77^Ad
3	0.42±0.04^Ad	0.30±0.02^Bd	1.95±0.19^Ad	1.57±0.04^Ac	20.96±0.52^Bcd	21.93±0.16^Ac	2.52±0.50^Ac	2.79±0.18^Ad	120.00±0.00^Ad	96.67±5.77^Bd
6	1.22±0.09^Ac	0.71±0.13^Bcd	4.02±0.41^Ac	3.39±0.87^Ab	19.63±0.65^Bd	22.81±1.62^Ac	3.40±0.81^Ac	3.56±0.89^Acd	210.00±65.57^Ac	130.00±17.32^Bd
11	1.63±0.13^Ab	1.14±0.19^Bbc	4.38±0.66^Abc	4.06±0.78^Ab	19.86±1.15^Bd	29.56±1.56^Aab	13.37±0.46^Ab	5.84±2.12^Bbc	353.33±41.63^Ab	156.67±15.28^Bcd
19	1.89±0.07^Ab	1.31±0.22^Bb	4.91±0.14^Aab	4.04±0.62^Ab	23.04±0.91^Bbcd	30.26±1.21^Aab	13.94±4.70^Ab	6.45±1.52^Bb	380.00±0.00^Ab	200.00±20.00^Bc
28	2.80±0.54^Aa	1.85±0.62^Ba	5.33±0.92^Aa	4.63±0.72^Aab	24.33±0.73^Bbc	30.84±1.26^Aab	26.85±3.47^Aa	11.92±2.40^Ba	510.00±60.83^Aa	300.00±26.46^Bb
46	2.76±0.13^Aa	2.03±0.20^Ba	5.28±0.43^Aa	5.37±0.82^Aa	29.39±1.09^Ba	33.76±1.52^Aa	23.45±3.29^Aa	11.11±2.09^Ba	546.67±25.17^Aa	453.33±94.52^Ba
年限	***	***	***	***	*	*	***	***	***	***
位置	***		ns		**		***		***
年限×位置	***		ns		ns		*		ns

种植年限/a	pH		电导率EC/（μS·cm^-1）		全碳TC/（g·kg^-1）		全氮TN/（g·kg^-1）		全磷TP/（g·kg^-1）
种植年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	9.28±0.16^Ac	9.28±0.16^Aa	130.27±3.93^Ae	130.27±3.93^Ac	4.98±0.11^Ad	4.98±0.11^Ac	0.28±0.04^Ac	0.28±0.04^Ac	0.46±0.02^Ad	0.46±0.02^Ac
3	10.05±0.13^Aab	9.41±0.08^Ba	306.00±10.39^Ade	130.00±5.20^Bc	5.32±0.03^Ad	5.13±0.20^Abc	0.22±0.00^Ad	0.19±0.01^Ad	0.49±0.01^Acd	0.47±0.01^Ac
6	10.08±0.02^Aab	9.59±0.25^Ba	438.00±91.39^Acd	202.27±68.49^Bbc	6.96±0.53^Ac	6.28±0.19^Ab	0.30±0.01^Ac	0.21±0.02^Ad	0.56±0.02^Acd	0.53±0.04^Abc
11	10.03±0.05^Aab	9.61±0.21^Ba	522.00±100.64^Ac	231.00±51.10^Bab	7.40±0.16^Abc	6.32±0.50^Ab	0.38±0.03^Ab	0.28±0.02^Ac	0.57±0.00^Ac	0.54±0.03^Abc
19	10.09±0.01^Aa	9.57±0.37^Ba	713.67±96.26^Abc	253.10±15.53^Bab	8.43±0.88^Aab	7.63±0.92^Aa	0.38±0.01^Ab	0.33±0.00^Abc	0.68±0.07^Aab	0.65±0.08^Aa
28	9.87±0.20^Ab	9.59±0.23^Ba	721.00±71.34^Ab	287.63±104.60^Bab	8.72±1.65^Aa	7.87±1.34^Aa	0.52±0.01^Aa	0.39±0.07^Aa	0.67±0.08^Aabc	0.64±0.08^Aa
46	9.98±0.12^Aab	9.47±0.15^Ba	987.00±227.66^Aa	321.67±45.01^Ba	9.64±0.23^Aa	8.29±0.78^Aa	0.52±0.03^Aa	0.38±0.02^Aab	0.70±0.10^Aa	0.63±0.06^Aab
年限	***	ns	***	*	***	***	***	***	***	*
位置	***		***		ns		ns		ns
年限×位置	***		***		ns		ns		ns
种植年限/a	土壤有机碳SOC/（g·kg^-1）		碳氮比C/N		速效氮AN/（mg·kg^-1）		速效磷AP/（mg·kg^-1）		速效钾AK/（mg·kg^-1）
种植年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	0.35±0.03^Ad	0.35±0.03^Ad	1.29±0.11^Ad	1.29±0.11^Ac	25.38±2.13^Ab	25.38±2.13^Abc	2.33±0.29^Ac	2.33±0.29^Ad	103.33±5.77^Ad	103.33±5.77^Ad
3	0.42±0.04^Ad	0.30±0.02^Bd	1.95±0.19^Ad	1.57±0.04^Ac	20.96±0.52^Bcd	21.93±0.16^Ac	2.52±0.50^Ac	2.79±0.18^Ad	120.00±0.00^Ad	96.67±5.77^Bd
6	1.22±0.09^Ac	0.71±0.13^Bcd	4.02±0.41^Ac	3.39±0.87^Ab	19.63±0.65^Bd	22.81±1.62^Ac	3.40±0.81^Ac	3.56±0.89^Acd	210.00±65.57^Ac	130.00±17.32^Bd
11	1.63±0.13^Ab	1.14±0.19^Bbc	4.38±0.66^Abc	4.06±0.78^Ab	19.86±1.15^Bd	29.56±1.56^Aab	13.37±0.46^Ab	5.84±2.12^Bbc	353.33±41.63^Ab	156.67±15.28^Bcd
19	1.89±0.07^Ab	1.31±0.22^Bb	4.91±0.14^Aab	4.04±0.62^Ab	23.04±0.91^Bbcd	30.26±1.21^Aab	13.94±4.70^Ab	6.45±1.52^Bb	380.00±0.00^Ab	200.00±20.00^Bc
28	2.80±0.54^Aa	1.85±0.62^Ba	5.33±0.92^Aa	4.63±0.72^Aab	24.33±0.73^Bbc	30.84±1.26^Aab	26.85±3.47^Aa	11.92±2.40^Ba	510.00±60.83^Aa	300.00±26.46^Bb
46	2.76±0.13^Aa	2.03±0.20^Ba	5.28±0.43^Aa	5.37±0.82^Aa	29.39±1.09^Ba	33.76±1.52^Aa	23.45±3.29^Aa	11.11±2.09^Ba	546.67±25.17^Aa	453.33±94.52^Ba
年限	***	***	***	***	*	*	***	***	***	***
位置	***		ns		**		***		***
年限×位置	***		ns		ns		*		ns

固沙年限/a	线虫总数		食细菌线虫BF		食真菌线虫FF		植物寄生线虫PP		捕食/杂食线虫OP
固沙年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	5.33±1.31^Ad	5.33±1.31^Ab	4.00±0.00^Ad	4.00±0.00^Ab	1.33±0.31^Ab	1.33±0.31^Aab	0.00±0.00^Aa	0.00±0.00^Ab	0.00±0.00^Ab	0.00±0.00^Ab
3	44.33±10.18^Acd	11.67±3.15^Bab	36.33±11.16^Acd	8.33±3.15^Bab	6.67±0.58^Aab	1.00±0.73^Bb	0.00±0.00^Aa	2.33±0.08^Aa	1.33±0.31^Ab	0.00±0.00^Ab
6	99.33±22.72^Abc	61.33±11.67^Ba	85.67±24.53^Abc	47.00±9.04^Bab	8.67±1.57^Aab	8.33±1.79^Ba	0.00±0.00^Aa	1.00±0.73^Aab	5.00±1.73^Ab	5.00±1.73^Aab
11	143.33±45.52^Aab	62.00±12.05^Ba	116.00±23.81^Ab	52.33±13.14^Ba	6.33±0.69^Aab	7.33±1.51^Bab	0.00±0.00^Aa	0.00±0.00^Ab	20.00±6.00^Aa	2.33±1.04^Ab
19	148.67±43.94^Aab	61.67±12.53^Ba	123.00±28.58^Ab	49.00±12.26^Bab	8.67±1.77^Aab	1.33±0.31^Bab	1.67±0.89^Aa	1.00±0.73^Aab	15.33±5.15^Aa	10.33±2.45^Aa
28	136.33±40.34^Ab	60.00±11.68^Ba	129.00±43.38^Ab	54.33±18.46^Ba	6.00±1.29^Aab	3.33±0.77^Bab	1.33±0.31^Aa	0.00±0.00^Ab	0.00±0.00^Ab	2.33±1.04^Ab
46	228.00±61.46^Aa	41.00±16.64^Bab	213.33±54.80^Aa	38.67±10.34^Bab	13.67±2.51^Aa	2.33±0.08^Bab	0.00±0.00^Aa	0.00±0.00^Ab	1.00±0.73^Ab	0.00±0.00^Ab
年限	**	*	**	*	ns	ns	ns	ns	*	*
位置	***		***		*		ns		ns
年限× 位置	*		**		ns		ns		ns

固沙年限/a	线虫总数		食细菌线虫BF		食真菌线虫FF		植物寄生线虫PP		捕食/杂食线虫OP
固沙年限/a	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
0	5.33±1.31^Ad	5.33±1.31^Ab	4.00±0.00^Ad	4.00±0.00^Ab	1.33±0.31^Ab	1.33±0.31^Aab	0.00±0.00^Aa	0.00±0.00^Ab	0.00±0.00^Ab	0.00±0.00^Ab
3	44.33±10.18^Acd	11.67±3.15^Bab	36.33±11.16^Acd	8.33±3.15^Bab	6.67±0.58^Aab	1.00±0.73^Bb	0.00±0.00^Aa	2.33±0.08^Aa	1.33±0.31^Ab	0.00±0.00^Ab
6	99.33±22.72^Abc	61.33±11.67^Ba	85.67±24.53^Abc	47.00±9.04^Bab	8.67±1.57^Aab	8.33±1.79^Ba	0.00±0.00^Aa	1.00±0.73^Aab	5.00±1.73^Ab	5.00±1.73^Aab
11	143.33±45.52^Aab	62.00±12.05^Ba	116.00±23.81^Ab	52.33±13.14^Ba	6.33±0.69^Aab	7.33±1.51^Bab	0.00±0.00^Aa	0.00±0.00^Ab	20.00±6.00^Aa	2.33±1.04^Ab
19	148.67±43.94^Aab	61.67±12.53^Ba	123.00±28.58^Ab	49.00±12.26^Bab	8.67±1.77^Aab	1.33±0.31^Bab	1.67±0.89^Aa	1.00±0.73^Aab	15.33±5.15^Aa	10.33±2.45^Aa
28	136.33±40.34^Ab	60.00±11.68^Ba	129.00±43.38^Ab	54.33±18.46^Ba	6.00±1.29^Aab	3.33±0.77^Bab	1.33±0.31^Aa	0.00±0.00^Ab	0.00±0.00^Ab	2.33±1.04^Ab
46	228.00±61.46^Aa	41.00±16.64^Bab	213.33±54.80^Aa	38.67±10.34^Bab	13.67±2.51^Aa	2.33±0.08^Bab	0.00±0.00^Aa	0.00±0.00^Ab	1.00±0.73^Ab	0.00±0.00^Ab
年限	**	*	**	*	ns	ns	ns	ns	*	*
位置	***		***		*		ns		ns
年限× 位置	*		**		ns		ns		ns

线虫属	营养类型	c-p值	线虫属的优势度
			0 a		3 a		6 a		11 a		19 a		28 a		46 a
			冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外	冠层下	冠层外
Mesorhabditis	BF	1	—	—	++	—	++	++	++	++	++	++	—	++	++	—
Eucephalobus	BF	2	+++	+++	+++	++	+++	+++	+++	++	+++	+++	+++	+++	+++	+++
Acrobeles	BF	2	—	—	++	+++	+++	+++	++	+++	++	++	+++	++	++	++
Acrobeloides	BF	2	+++	+++	+++	+++	+++	+++	+++	+++	+++	+++	+++	+++	+++	+++
Eumonhystera	BF	2	—	—	—	—	—	++	—	—	—	—	—	—	—	—
Ceratoplectus	BF	2	—	—	—	—	—	—	—	—	—	—	—	—	++	—
Paraphelenchus	FF	2	+++	+++	++	+++	++	++	++	+++	++	—	++	++	++	++
Aphelenchoides	FF	2	—	—	—	—	++	—	—	—	++	—	—	—	—	—
Tylolaimophorus	FF	3	—	—	++	—	++	+++	++	++	++	++	++	—	+	++
Filenchus	PP	2	—	—	—	+++	—	—	—	—	—	—	—	—	—	—
Psilenchus	PP	2	—	—	—	+++	—	++	—	—	++	—	+	—	—	—
Rotylenchus	PP	3	—	—	—	—	—	—	—	—	++	++	—	—	—	—
Prodorylaimium	OP	5	—	—	—	—	—	—	+	—	++	++	—	—	—	—
Aporcelaimium	OP	5	—	—	++	—	++	++	+++	++	++	+++	—	++	+	—
Discolaimus	OP	5	—	—	—	—	++	—	—	—	—	—	—	—	—	—