中国科学院大学学报2025，Vol.42Issue(3)：328-338,11.DOI:10.7523/j.ucas.2023.043
藏东南墨脱海拔梯度上农业活动对土壤无机氮含量的影响
Effects of agricultural activities on soil inorganic nitrogen along an altitudinal gradient in Motuo,Southeastern Xizang,China
摘要
Abstract
Soil inorganic nitrogen(SIN,NH4+-N,and NO3--N)is a vital indicator of soil N supply.Studying the current status of farmlands' soil inorganic nitrogen(SIN)on the Qinghai-Xizang Plateau is important to achieve the sustainability of plateau agriculture development.Ten pairs of farmland and forest soils were collected along the sampling gradient from 800 to 2 000 m(a.s.l.)in Motuo of southeastern Xizang,to investigate the effects of agricultural activities on SIN and clarify the environmental drivers of SIN.The results have shown that human activities significantly changed the concentration and spatial distribution pattern of SIN in farmlands.The topsoil(0-10 cm)was vulnerable to human activities.NH4+-N concentration of topsoil decreased significantly and NO3--N concentration increased significantly after reclamation.The SIN of the forests did not differ significantly among layers,but large differences were seen in the farmlands' SIN among layers.SIN in forest ecosystems was influenced by altitude,soil temperature,soil moisture,and pH value,while agricultural ecosystems were not sensitive to environmental factors.The change amount of SIN after reclamation was mainly determined by soil temperature and soil pH value.In conclusion,reasonable agricultural management is necessary to achieve sustainable development of regional agriculture.关键词
藏东南/海拔垂直带/农业活动/土壤无机氮/墨脱Key words
Southeastern Xizang/transect sampling/farmlands/soil inorganic nitrogen/Motuo分类
农业科学引用本文复制引用
雷昊晶,旭日,曲松波,沙马日布,李凤滋,张林,梁尔源..藏东南墨脱海拔梯度上农业活动对土壤无机氮含量的影响[J].中国科学院大学学报,2025,42(3):328-338,11.基金项目
国家自然科学基金(42075164,U21A20185,42030508)和中国科学院战略性先导科技专项(XDA20050102)资助 （42075164,U21A20185,42030508）
