The structure and pattern of farmland shelterbelts in Jiuquan Oasis of Hexi Corridor

doi:10.7522/j.issn.1000-694X.2023.00095

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (6): 237-245.DOI: 10.7522/j.issn.1000-694X.2023.00095

The structure and pattern of farmland shelterbelts in Jiuquan Oasis of Hexi Corridor

Wangyizhuang Lv¹^,²(), Wenzhi Zhao¹^,²()

^1.Chinese Ecosystem Network Research Linze Inland Basin Research Station / Key Laboratory of Ecohydrology of Inland River Basin，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2022-12-03 Revised:2023-02-20 Online:2023-11-20 Published:2023-11-30
Contact: Wenzhi Zhao

Abstract

Abstract:

Farmland shelterbelts can provide effectively protection for farmlands against wind storms. However， completely constructed shelterbelt systems not only need much water resource， but also have some negative influences like land threaten and yield reduction. Thus， studying the spatial distribution of farmland shelterbelts， its structure， and the ratio of belt to patch at landscape scale is the basis of building water-saving oases. Jiuquan oasis， located in the middle course of Taolai River in western Hexi Corridor， is a typical arid oasis. In this paper， Jiuquan oasis was selected as the research object to study the method of data source selection and oasis protection system extraction based on remote sensing， the pattern and scale dependence of oasis farmland shelterbelts system， farmland shelterbelt structure and some other scientific problems. Then， the method of extracting farmland shelterbelts' attributes from remote sensing was discussed， and the spatial pattern and structure of farmland shelterbelts in the study area was analyzed. The results showed：（1） the Sentinel-2A remote sensing images combined with the phenological difference between shelterbelts and crop could extract farmland shelterbelts effectively， and reflect the ratio of belt to patch and its distribution truly and comprehensively. The calculated results were consistent with the field survey. （2） the farmland shelterbelts in the middle course of Taolai River were dominated by Populus alba var. pyramidalis. More than 80% of farmland shelterbelts had the ratio of belt to patch between 2.50%-7.50% and had obvious scale effect. The scale effect was obvious within 0.1-10 km， and decreased within 10-20 km with the increasing extent， and disappeared gradually when the extent was greater than 20 km. （3） the farmland shelterbelts had an average tree height of 17.5 m and an average DBH of 25.7 cm. The overall shelterbelts were dominated by ventilating structure， and the phenomenon of lacking network and broken belts was obvious. The integrity of shelterbelt networks was low， where the integrity index was below 0.4 generally.

Key words: farmland shelterbelts, Hexi Corridor, Jiuquan oasis, structure of shelterbelts network, scale effect

CLC Number:

S727.2

Wangyizhuang Lv, Wenzhi Zhao. The structure and pattern of farmland shelterbelts in Jiuquan Oasis of Hexi Corridor[J]. Journal of Desert Research, 2023, 43(6): 237-245.

Figures/Tables 10

Fig.1 Location of the study area and distribution of sampling points

Table 1 Parameter connotation and calculation method of pattern structure of farmland shelterbelts

指标	因子含义	指标意义	公式
带斑比 $P$	S_b 代表林网面积，A代表区域内需要被保护的农田面积	代表防护林的相对丰富度，数值越大则代表防护林在农田的占比越高	$P = S b A$
完整度指数 $C$	i代表地类为林地，c_ijk 为在临界距离之内的林地ｊ与ｋ的连接状况；n_i 为景观中林带的条数	代表该地块内防护林网的连续性，反映防护林形成条带或网状的完整程度，最大值为100，数值越大林网完整度越高	$C = ∑ j = k n c i j k n i n i - 1 2 × 100$
疏透度 $β$	$S 1$ 是林带纵断面透光孔隙总面积， $S$ 为林带纵断面垂直投影总面积	表示林带疏密状况和透风程度的指标。林带间隙越大则疏透度越大，疏透度达到1则代表不存在林带	$β = ? S 1 S × 100 %$

Table 1 Parameter connotation and calculation method of pattern structure of farmland shelterbelts

指标	因子含义	指标意义	公式
带斑比 $P$	S_b 代表林网面积，A代表区域内需要被保护的农田面积	代表防护林的相对丰富度，数值越大则代表防护林在农田的占比越高	$P = S b A$
完整度指数 $C$	i代表地类为林地，c_ijk 为在临界距离之内的林地ｊ与ｋ的连接状况；n_i 为景观中林带的条数	代表该地块内防护林网的连续性，反映防护林形成条带或网状的完整程度，最大值为100，数值越大林网完整度越高	$C = ∑ j = k n c i j k n i n i - 1 2 × 100$
疏透度 $β$	$S 1$ 是林带纵断面透光孔隙总面积， $S$ 为林带纵断面垂直投影总面积	表示林带疏密状况和透风程度的指标。林带间隙越大则疏透度越大，疏透度达到1则代表不存在林带	$β = ? S 1 S × 100 %$

Fig.2 Scale effect of farmland shelterbelts on moving window method

Table 2 Statistical results of field survey

样地序号	平均胸径/cm	平均树高/m	带斑比/%	疏透度
1	20.4±1.76	15.7±1.27	7.72	0.78
2	19.7±0.90	16.9±0.26	1.93	0.56
3	23.8±1.83	20.4±0.55	4.09	0.88
4	45.5±3.67	15.0±0.90	2.31	0.85
5	26.9±1.10	13.3±1.53	5.71	0.82
6	22.0±1.17	17.6±1.64	3.70	0.53
7	19.2±0.78	20.9±0.58	11.42	0.24
8	25.8±1.97	20.2±0.84	3.61	0.77
9	24.3±1.06	20.4±0.64	5.48	0.44
10	21.8±1.51	17.2±1.95	2.57	0.69
11	30.8±0.97	20.1±0.53	4.31	0.62
12	24.3±0.51	21.3±1.00	3.81	0.76
13	31.7±1.29	21.9±0.68	3.54	0.84
14	35.1±1.16	18.9±0.62	6.34	0.82
15	22.7±0.95	15.7±0.49	2.35	0.27
16	20.3±0.93	17.2±1.40	12.52	0.25
17	15.4±0.85	14.7±0.57	2.45	0.51
18	32.6±3.18	8.3±0.68	6.88	0.92

Fig.3 Remote sensing image and extraction of shelterbelts from April， June and August

Fig.4 Scale effect of farmland shelterbelts structure

Fig.5 Frequency distribution of ration of belt to patch of field survey

Fig.6 Frequency distribution of indexes at 2 km grain

Fig.7 Nuclear density distribution of shelterbelts structure

Fig.8 Correlation of shelterbelts structure and distance from the head of the canal

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The structure and pattern of farmland shelterbelts in Jiuquan Oasis of Hexi Corridor

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