高原农业2025，Vol.9Issue(5)：561-571,11.DOI:10.19707/j.cnki.jpa.2025.05.004
西藏森林区土壤营养元素分布特征及其受土壤和地形因素影响的研究
A Study of the Distribution Characteristics of Soil Nutrient Elements and Their Influence by Soil and Topographic Factors in Xizang Forest Region
摘要
Abstract
Forests are an important type of terrestrial ecosystem,playing a crucial role in enriching biodiversity,maintaining land productivity,and carbon sink/source balance.Taking into account the main environmental factors of forest distribution in Xizang,this study collected 0～20 cm soil from the surface of all forest types,and discussed the characteristics of soil nutrient distribution in forest distribution areas and the impact of soil and terrain on them.The results showed:(1)The contents of TN,TP,TK and SOM in Xizang forest area were 0.59～10.58 g/kg,0.20～2.14 g/kg,10.09～29.97 g/kg and 3.43～311.05 g/kg,respectively;the content range of AK,AP,and AN is 31.22～842.89 mg/kg,1.55～464.68 mg/kg,and 51.49～743.89 mg/kg.TP and TK belonged to moderate variation,while TN,AK,AP,AN,and SOM belonged to high-intensity variation.(2)TN,TP,TK,and AP exhibited strong spatial correlations,showing moderate spatial correlations,while AK and SOM showed weak spatial correlations.(3)Grey brown soil was the soil with the richest nutrient elements in the study area,while red soil had the lowest nutrient element content.Compared with other soil types,the AK content was the lowest,and the distribution of AP content varied the most among different soils.Limestone was the soil with the richest nutrient content in the study area,while basalt was the soil with the lowest nutrient content.The distribution of AK content varied greatly among different parent rock types.(4)As the slope increased,TP and AK also increased;The content of TN,TK,AP,AN,and SOM varied irregularly.The soil nutrient content was higher within the range of 5°～14°,and lower within the range of less then 5°.The distribution of AP content varied the most among different slope ranges.(5)The content of TP and AP generally decreased with increasing altitude in different altitude ranges.The content of TP,AK,and AN was highest within the altitude range of 800 m to 1 000 m,while the content of TN,TP,and SOM was lowest within the altitude range of 1 500 m to 2 000 m.The distribution of AP content varied the most among different altitude ranges.(6)In different slope directions,except for TK,the overall nutrient content of sunny slopes was higher than that of shady slopes.The nutrient content of soil was higher in the west slope and north slope directions,while it was lower in the east slope and northeast slope directions.The distribution of AP content varied greatly in different slope directions.关键词
西藏自治区/森林区/营养元素/空间分布Key words
Xizang Autonomous Region/Forest area/Nutrient elements/Spatial distribution分类
农业科技引用本文复制引用
陈松焱,刘钟元,王永霞,李超,喻武..西藏森林区土壤营养元素分布特征及其受土壤和地形因素影响的研究[J].高原农业,2025,9(5):561-571,11.基金项目
西南高山峡谷区水土流失综合防治技术与示范项目(2022YFF1302904)资助. （2022YFF1302904）
