黄土高原沟壑区原状土壤氮素迁移  

Nitrogen Migration in Intact Soil of Hilly-gully Region of Loess Plateau

作　　者：杨毓峰[1,2] 李世清[1] 

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨陵712100 [2]广东海洋大学农学院,广东湛江524025

出　　处：《广东海洋大学学报》2010年第6期64-69,共6页Journal of Guangdong Ocean University

基　　金：国家自然科学基金(39970151);国家自然科学基金(39970459);国家自然科学基金重点项目(30230230);国家开放实验室基金(10501-85);开放实验室基金(10501-104);国家基础研究重大项目前期研究专项(国科基[2001]50号)

摘　　要：以中国生态系统研究网络CERN长武王东沟实验站的坡耕地和塬耕地为供试土壤,研究了黄土高原沟壑塬区旱耕地原状土壤氮素迁移和时空变异。结果表明：耕作土壤NO3--N为23.1－33.8 mg/kg,NH4＋-N为0.23－0.50mg/kg,DOC为9.17－13.38 mg/kg,P为0.18－0.23 mg/kg;坡耕地和塬耕地的NO3--N和NH4＋-N主要集中在0－20 cm的上层土壤,中下层土壤NO3--N和NH4＋-N起源于上层淋溶迁移和累积;高含量时养分淋溶溶出呈指数衰减型;NO3--N、NH4＋-N、DOC向下层的迁移塬耕地慢于坡耕地。Plateau cultivated soil and gully cultivated soil from the northern part of Wangdong hilly-gully region in Changwu lab-station of CERN was used as research soil.The nitrogen migration and its time-space variation of intact soil core in arid agriculture ecosystem in loess plateau were studied.The results are： the content of NO3--N was from 23.1 to 33.8 mg/kg,NH4＋-N from 0.23 to 0.50 mg/kg,DOC from 9.17 to 13.38 mg/kg,P from 0.18 to 0.23 mg/kg.In arid cultivated soil,NO3--N and NH4＋-N mainly concentrate in top-layer of the soil from 0–20 cm.NO3--N and NH4＋-N in the mid-and low-layer of the soil migrated from leaching accumulation of top-layer soil.Migrating rate of NO3—N,NH4＋-N,DOC from top-layer to low-layer of soil in plateau cultivated soil is slower than that in gully cultivated soil.

关 键 词：氮素迁移 坡耕地 塬耕地 原状土壤 王东沟小流域 黄土高原沟壑区 

分 类 号：S157.3[农业科学—土壤学] S151.9[农业科学—农业基础科学]