Characteristics and influencing factors of soil carbon and nitrogen changes under different vegetation communities in the headwaters of the Irtysh River

doi:10.13466/j.cnki.lczyyj.2025.02.012

Abstract

Abstract:

The spatial differences in soil carbon and nitrogen content in the source area are key to the water and soil conservation and ecosystem stability of the water source conservation area.Focusing on the source area of the Irtysh River ecosystem,we studied the carbon and nitrogen components of soils under three different vegetation types:Temperate desert,temperate meadows,as well as Mountain coniferous forests.Using redundancy analysis,we revealed the main environmental factors influencing soil carbon and nitrogen.The findings are as follows:1) Mountain coniferous forests have the highest stable soil carbon and nitrogen content,which is significantly higher than that of temperate meadows and temperate deserts(P<0.05).2) With increasing altitude,the unstable carbon and nitrogen content shows a descending gradient of temperate desert,temperate meadows and mountain coniferous forest.3) Vegetation type is the main driver of soil carbon and nitrogen distribution,with soil moisture content(SMC),soil temperature(ST),fractional vegetation cover(FVC),and leaf area index(LAI) being the primary influencing factors.Among these,pH has the highest impact on soil carbon and nitrogen in temperate deserts,SMC is the highest impact factor for temperate meadows,and soil salinity(SS) is the highest impact factor for Mountain coniferous forests.4) In the mid-latitude source area,soil carbon and nitrogen content under the same vegetation type is higher than in non-source areas,and in low-latitude source areas,it is higher than in mid-latitude regions.Overall,these results indicate that soil carbon and nitrogen content in the Irtysh River source area are influenced by different vegetation types,with pH,SMC,and SS being the main factors affecting soil carbon and nitrogen content across different vegetation communities.

Key words: vegetation type, altitude, river source district, soil carbon and nitrogen, influencing factors

CLC Number:

S718.5

ZHU Yu, LI Yanhong, YIN Shujing, MIAO Guanghua. Characteristics and influencing factors of soil carbon and nitrogen changes under different vegetation communities in the headwaters of the Irtysh River[J]. Forest and Grassland Resources Research, 2025, (2): 117-125.

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环境因子	温带荒漠	温带草原	山地针叶林
土壤温度(ST)/℃	30.39± 0.75^*	26.49± 1.06^*	16.67± 3.45^*
土壤含水率(SMC)/%	5.04± 1.3^*	13.08± 2.4^*	11.27± 2.79^*
土壤pH	6.96± 0.13	7.02± 0.84	6.71± 0.21
土壤盐分(SS)/(g/kg)	2.18± 0.96^*	0.35± 0.06	0.38± 0.17
海拔高度(ALT)/h	875.95±74.18^*	1 211.11±35.29^*	1 479.22±34.37^*
植被覆盖度(FVC)/%	0.40± 0.04	0.47± 0.07	0.66± 0.03^*
叶面积指数(LAI)	1.01± 0.18	1.29± 0.26	2.17± 0.2^*