Study on storage of soil surface carbon and nitrogen and its influencing factors in UradNational Nature Reserve of Haloxylon ammodendron based on SHAP values

doi:10.7522/j.issn.1000-694X.2022.00086

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 170-183.DOI: 10.7522/j.issn.1000-694X.2022.00086

Study on storage of soil surface carbon and nitrogen and its influencing factors in UradNational Nature Reserve of Haloxylon ammodendron based on SHAP values

Xingchi Jiang¹^,²(), Wensuyalatu³, Junyao Li¹^,², Feng Chen⁴, Jinyu Hu⁵, Guolin Wang³, Sujuan Qing⁶, Jiannan Lu¹^,², Shaokun Wang¹^,²()

^1.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China
^3.Urad Rear Banner Management Station of National Nature Reserve of Haloxylon ammodendron and Equus hemionus，Urad Rear Banner 015543，Inner Mongolia，China
^4.Bureau of Urad National Nature Reserve in Bayannur City，Bayannur 015006，Inner Mongolia，China
^5.Ershike Forest Farm of Hengshan District，Yulin City，Yulin 719000，Shaanxi，China
^6.Bayannur City Forestry and Grassland Business Development Center，Bayannur 015002，Inner Mongolia，China

Received:2022-07-12 Revised:2022-08-23 Online:2023-03-20 Published:2023-04-12
Contact: Shaokun Wang

Abstract

Abstract:

Soil carbon and nitrogen storage are of great significance to carbon and nitrogen cycles and global change researches. We use correlation analysis， random forest and SHAP interpretation methods to elucidate the distribution and variation patterns of soil surface carbon and nitrogen storages and determine the key influencing factors in the Urat National Nature Reserve of Haloxylon ammodendron. In this study， 61 plots were set up in the protection zone using the grid layout method， and the surface soil （0-20 cm） was collected to determine the soil carbon and nitrogen storage and analyze their main influencing factors. The carbon storage in the core area （1 429.91 g·m^-2） was significantly higher than those in the buffer area （1 194.09 g·m^-2） and the experimental area （986.36 g·m^-2）. The soil nitrogen storage in different areas did not differ significantly （P>0.05）， with 76.79 g·m^-2， 62.39 g·m^-2 and 51.28 g·m^-2 in the core， buffer and experimental area， respectively. Soil pH， electrical conductivity， the height of H. ammodendron， species richness， vegetation cover and herbaceous biomass differed significantly （P<0.05） among the three areas based on ANOVA. The key factors affecting soil carbon storage were soil carbon content， soil nitrogen content， soil water content， electrical conductivity， soil bulk density， the height of H. ammodendron， plant density and pH. SHAP analysis showed that soil bulk density and pH were negatively correlated with soil carbon storage， while the other significant factors were positively correlated with soil carbon storage. The key factors affecting soil nitrogen storage were soil nitrogen content， soil carbon content， electrical conductivity， soil bulk density， soil water content， the height of H. ammodendron， vegetation cover， C/N and plant density， and SHAP analysis showed that soil bulk density and C/N were negatively correlated with soil nitrogen storage， while the other significant factors were positively correlated with soil nitrogen storage. It was also found that the contribution to soil carbon and nitrogen storage was significantly increased for the average plant height of H. ammodendron higher than 2 m. Therefore， the sustainable management of H. ammodendron is beneficial on soil quality improvement in the Urat National Nature Reserve of H. ammodendron forest.

Key words: Haloxylon ammodendron, soil carbon storage, soil nitrogen storage, SHAP

CLC Number:

X825

Xingchi Jiang, Wensuyalatu, Junyao Li, Feng Chen, Jinyu Hu, Guolin Wang, Sujuan Qing, Jiannan Lu, Shaokun Wang. Study on storage of soil surface carbon and nitrogen and its influencing factors in UradNational Nature Reserve of Haloxylon ammodendron based on SHAP values[J]. Journal of Desert Research, 2023, 43(2): 170-183.

Figures/Tables 10

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土壤和植被参数	核心区	缓冲区	试验区	平均值
粗砂含量/%	77.44±5.44^a	74.95±7.56^a	73.65±6.96^a	75.38±6.77
细砂含量/%	21.11±5.28^a	23.3±7.09^a	24.58±6.28^a	22.97±6.31
黏粉粒含量/%	1.45±0.57^a	1.75±0.82^a	1.77±0.78^a	1.65±0.73
容重/（g·cm^-3）	1.38±0.19^a	1.42±0.20^a	1.51±0.11^a	1.44±0.18
土壤含水率/%	1.85±1.21^a	1.56±1.28^a	1.14±0.57^a	1.52±1.09
pH	9.02±0.63^b	9.36±0.35^a	9.41±0.24^a	9.26±0.47
电导率/（μS·cm^-1）	348.21±434.82^a	147.16±217.84^b	103.3±137.48^b	201.99±309.46
土壤全碳含量/（g·kg^-1）	5.5±3.24^a	4.79±4.89^a	3.33±1.17^a	4.56±3.51
土壤全氮含量/（g·kg^-1）	0.3±0.25^a	0.25±0.27^a	0.17±0.05^a	0.24±0.22
碳氮比	20.81±6.39^a	19.9±3.13^a	19.28±3.42^a	20.01±4.56
物种丰富度	5±2.52^b	4.32±2.03^b	6.45±1.72^a	5.25±2.27
植物密度/（株·m^-2）	51.35±36.84^a	33.58±28.35^a	37.43±29.94^a	40.96±32.42
植被盖度/%	18.43±11.92^a	10.35±5.91^b	18.12±12.64^a	15.68±11.1
草本生物量/（g·m^-2）	1.01±1.13^ab	0.73±0.73^b	1.88±2.01^a	1.2±1.46
梭梭树高度/cm	136.81±91.93^a	82.29±43.64^b	72.71±63.98^b	97.92±74.43
梭梭树密度/（株·hm^-2）	387.3±330.74^a	458.33±326.04^a	416.67±409.04^a	420.22±352.1

土壤和植被参数	核心区	缓冲区	试验区	平均值
粗砂含量/%	77.44±5.44^a	74.95±7.56^a	73.65±6.96^a	75.38±6.77
细砂含量/%	21.11±5.28^a	23.3±7.09^a	24.58±6.28^a	22.97±6.31
黏粉粒含量/%	1.45±0.57^a	1.75±0.82^a	1.77±0.78^a	1.65±0.73
容重/（g·cm^-3）	1.38±0.19^a	1.42±0.20^a	1.51±0.11^a	1.44±0.18
土壤含水率/%	1.85±1.21^a	1.56±1.28^a	1.14±0.57^a	1.52±1.09
pH	9.02±0.63^b	9.36±0.35^a	9.41±0.24^a	9.26±0.47
电导率/（μS·cm^-1）	348.21±434.82^a	147.16±217.84^b	103.3±137.48^b	201.99±309.46
土壤全碳含量/（g·kg^-1）	5.5±3.24^a	4.79±4.89^a	3.33±1.17^a	4.56±3.51
土壤全氮含量/（g·kg^-1）	0.3±0.25^a	0.25±0.27^a	0.17±0.05^a	0.24±0.22
碳氮比	20.81±6.39^a	19.9±3.13^a	19.28±3.42^a	20.01±4.56
物种丰富度	5±2.52^b	4.32±2.03^b	6.45±1.72^a	5.25±2.27
植物密度/（株·m^-2）	51.35±36.84^a	33.58±28.35^a	37.43±29.94^a	40.96±32.42
植被盖度/%	18.43±11.92^a	10.35±5.91^b	18.12±12.64^a	15.68±11.1
草本生物量/（g·m^-2）	1.01±1.13^ab	0.73±0.73^b	1.88±2.01^a	1.2±1.46
梭梭树高度/cm	136.81±91.93^a	82.29±43.64^b	72.71±63.98^b	97.92±74.43
梭梭树密度/（株·hm^-2）	387.3±330.74^a	458.33±326.04^a	416.67±409.04^a	420.22±352.1

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Study on storage of soil surface carbon and nitrogen and its influencing factors in UradNational Nature Reserve of Haloxylon ammodendron based on SHAP values

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