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水蚀风蚀交错带不同退耕模式对 土壤有机碳及全氮的影响
刘学彤1,2; 魏艳春1,2; 杨宪龙1,2; 郝明德1,3; 魏孝荣1,2
2016
Source Publication应用生态学报
Volume27Issue:1Pages:91-98
Abstract

以黄土高原水蚀风蚀交错带不同退耕模式为研究对象,分析了不同模式退耕地( 农
地退耕后自然恢复草地、退耕后种植苜蓿和退耕后种植柠条) 和相邻未退耕农地土壤有机碳
和全氮含量的差异以及它们随退耕年限的动态变化.结果表明: 不同退耕模式均能提高0 ~ 10
cm 土层土壤有机碳和全氮含量,但效果受退耕年限的影响.与相邻未退耕农地相比,退耕后自
然恢复草地在演替10 年时0~10 cm 土层土壤有机碳和全氮含量不受影响,而在演替20 年时
均显著增加; 退耕种植苜蓿后0~10 cm 土层土壤有机碳和全氮含量分别增加51.6%~ 82.9%
和43.4%~67.0%,其储量的增加速率分别为0.17~0.46 和0.015~0.043 t·hm-2·a-1,但不同
退耕年限间差异不显著; 退耕后种植柠条前20 年土壤有机碳和全氮含量增加较多,退耕40
年时增加量有所降低.农田退耕后种植柠条40 年、苜蓿20 年,其固存碳、氮的能力优于退耕后
自然恢复草地,然而由于受土壤水分条件的限制和自身高耗水的特性,这2 种退耕模式可能
不具备长期的增碳、增氮能力.

Other Abstract

This study was conducted to analyze the responses of soil organic carbon ( SOC) and total
nitrogen ( TN) to three typical re-vegetation patterns,i.e.,grassland,alfalfa land and peashrub
land on the Loess Plateau of China,and also to assess the dynamics of SOC and TN with re-vegetation
age. The results showed that all the three re-vegetation practices increased the concentrations of
SOC and TN in the 0-10 cm soil layer,but their effects differed with re-vegetation age. Compared
with adjacent croplands,the concentrations of SOC and TN in the 0-10 cm soil layer in grassland
did not change within 10 years of succession,but increased after 20 years of succession. In alfalfa
land,the concentrations of SOC and TN increased by 51.6%-82.9% and 43.4%-67.0% in the 0-
10 cm soil layer,with the increasing rates of stocks of SOC and TN being 0.17-0.46 and 0.015-
0.043 t·hm-2·a-1,respectively. However,SOC and TN were not affected by re-vegetation age in
alfalfa land. The increases of concentrations of SOC and TN remained high in the first 20 years after
conversion of cropland to peashrub land,but decreased after 40 years of conversion. In conclusion,
the conversion of croplands to peashrub or alfalfa land could be better in contributing to high stocks
of SOC and TN than natural succession of grassland. However,their positive effects on the enrichment
of SOC and TN may not be sustainable due to the scarcity of soil moisture and high water con-sumption of these two re-vegetation plants.

Keyword水蚀风蚀交错带 退耕模式 退耕年限 有机碳 全氮
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8759
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源环境学院
2.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
3.西北农林科技大学水土保持研究所
Recommended Citation
GB/T 7714
刘学彤,魏艳春,杨宪龙,等. 水蚀风蚀交错带不同退耕模式对 土壤有机碳及全氮的影响[J]. 应用生态学报,2016,27(1):91-98.
APA 刘学彤,魏艳春,杨宪龙,郝明德,&魏孝荣.(2016).水蚀风蚀交错带不同退耕模式对 土壤有机碳及全氮的影响.应用生态学报,27(1),91-98.
MLA 刘学彤,et al."水蚀风蚀交错带不同退耕模式对 土壤有机碳及全氮的影响".应用生态学报 27.1(2016):91-98.
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