免耕不同秸秆覆盖量对土壤可溶性氮素累积及运移的影响

生态学杂志

免耕不同秸秆覆盖量对土壤可溶性氮素累积及运移的影响

何传瑞^1,3,全智²,解宏图²,鲁彩艳^1*,陈欣¹,史奕^1

(¹中国科学院污染生态与环境工程重点实验室, 沈阳 110016; ²中国科学院沈阳应用生态研究所, 沈阳 110016; ³中国科学院大学, 北京 100049)

出版日期:2016-04-10 发布日期:2016-04-10

Accumulation and transport of soil extractable N affected by corn stover mulching quantity in no-tillage system.

HE Chuan-rui^1,3, QUAN Zhi², XIE Hong-tu², LU Cai-yan^1*, CHEN Xin¹, SHI Yi^1

(¹Key Laboratory of Pollution Ecological and Environmental Engineering, Chinese Academy of Sciences, Shenyang 110016, China; ^2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ^3University of Chinese Academy of Sciences, Beijing, 100049, China).

Online:2016-04-10 Published:2016-04-10

摘要/Abstract

摘要： 通过田间原位试验，研究了连续8年免耕秸秆覆盖对土壤剖面NH₄⁺-N、NO₃^--N和可溶性有机氮(EON)累积、垂直运移和淋溶损失的影响。试验设5个处理，分别为常规垄作对照(RT)、免耕无秸秆覆盖(NT₀)、免耕+33%秸秆覆盖(NT₃₃)、免耕+67%秸秆覆盖(NT₆₇)和免耕+100%秸秆覆盖(NT₁₀₀)。结果表明：免耕秸秆覆盖条件下，土壤可溶性氮素主要以NO₃^--N形态存在，其次是EON；免耕不同秸秆覆盖量对土壤NO₃^--N累积和垂直运移特性的影响不同；NT₃₃和NT₆₇处理中土壤NO₃^--N淋溶至40～80 cm土层，而NT₁₀₀处理淋溶至40～60 cm土层；与RT处理相比，NT₆₇和NT₁₀₀处理显著降低了0～20 cm土层NO₃^--N和EON库的容量，但增加了40～60 cm土层NO₃^--N库的容量；说明免耕秸秆覆盖增加了土壤NO₃^--N自耕层向深层的垂直运移和淋溶损失，但对EON和NH₄+-N无显著影响。

关键词: 回归分析, 鮸, 形态性状, 相关分析, 通径分析

Abstract: An 8year field experiment was conducted to study the accumulation, vertical transport and leaching of soil NH₄⁺-N, NO₃^--N and extractable organic N (EON) affected by corn stover mulching in no-tillage system. The experiment consisted of five treatments, including a ridge tillage as control (RT), no-tillage without corn stover mulching (NT0), no-tillage with 33% corn stover mulching (NT₃₃), no-tillage with 67% corn stover mulching (NT₆₇), and no-tillage with 100% corn stover mulching (NT₁₀₀). The results showed that soil extractable N mainly existed in form of NO₃^--N, followed by EON in the no-tillage system with corn stover mulching. Corn stover mulching with different quantities significantly affected the accumulation and vertical transport of soil NO₃^--N in no-tillage system. The soil NO₃^--N was leached to the 40-80 cm soil layer in the NT₃₃ and NT₆₇ treatments, and the 40-60 cm soil layer in the NT₁₀₀ treatment. Compared to RT treatment, NT₆₇ and NT₁₀₀ treatments significantly decreased the capacity of NO₃^--N and EON pools in the 0-20 cm soil layer, and increased that of NO₃^--N pool in the 40-60 cm soil layer. Our results suggest that corn stover mulching increased the vertical transport and leaching loss of soil NO₃^--N pool from cultivation layer to deep soil in no-tillage system, and had no influence on the soil EON and NH₄⁺-N.

Key words: path analysis, morphometric trait, correlation analysis, regression analysis, Miichthys miiuy

何传瑞1,3,全智2,解宏图2,鲁彩艳1*,陈欣1,史奕1. 免耕不同秸秆覆盖量对土壤可溶性氮素累积及运移的影响[J]. 生态学杂志.

HE Chuan-rui1,3, QUAN Zhi2, XIE Hong-tu2, LU Cai-yan1*, CHEN Xin1, SHI Yi1. Accumulation and transport of soil extractable N affected by corn stover mulching quantity in no-tillage system.[J]. cje.

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