黄土高原丘陵区退耕还林地土壤碳氮库的动态变化(英文)
为了揭示坡耕地退化土壤植被恢复后土壤中碳(C)、氮(N)运移规律,采用植被次生演替空间序列代替时间序列的方法,研究了黄土丘陵沟壑区纸坊沟流域不同植被恢复模式下的C、N库及其相互关系在土壤剖面的时空变化。结果表明退化农地的造林显著地促进了CO2的固存,恢复了土壤N的可获得性,进而降低了N不足对可持续的CO2固存的限制。植被恢复显著地促进了0~60 cm土壤有机碳(soil organic carbon,SOC)和总氮(total nitrogen,TN)的积累,而只有在高于一定的恢复时间阈值(如26 a)下,促进了SOC库和TN库间的线性相关性。在土壤剖面上,SOC和TN库、SOC/TN库比以及...
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Published in | 农业工程学报 Vol. 30; no. 23; pp. 148 - 157 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
2014
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Subjects | |
Online Access | Get full text |
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Summary: | 为了揭示坡耕地退化土壤植被恢复后土壤中碳(C)、氮(N)运移规律,采用植被次生演替空间序列代替时间序列的方法,研究了黄土丘陵沟壑区纸坊沟流域不同植被恢复模式下的C、N库及其相互关系在土壤剖面的时空变化。结果表明退化农地的造林显著地促进了CO2的固存,恢复了土壤N的可获得性,进而降低了N不足对可持续的CO2固存的限制。植被恢复显著地促进了0~60 cm土壤有机碳(soil organic carbon,SOC)和总氮(total nitrogen,TN)的积累,而只有在高于一定的恢复时间阈值(如26 a)下,促进了SOC库和TN库间的线性相关性。在土壤剖面上,SOC和TN库、SOC/TN库比以及SOC-TN间的线性相关性均随着土壤深度的增加而降低。与自然恢复相比,人工林在短期内具有CO2固存的优势,但由于随着恢复时间的增加,SOC增幅越来越大于TN增幅的事实,表明造林对碳固存的可持续性需在一个较长的时段下来评估,尤其需要关注20 cm以下层土壤。研究结果为黄土高原的生态修复和减缓温室效应提供了理论依据。 |
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Bibliography: | soils; carbon; nitrogen; vegetation restoration; grain for green project; Loess Plateau Liang Aihua, Han Xinhui, Zhao Fazhu, Ren Guangxin, Yang Gaihe ( 1. College of Agronomy, Northwest A &FUn ivers ity, Yangling 712100, China; 2. The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China) 11-2047/S The effect of vegetation restoration on soil carbon(C) and nitrogen(N) stocks is an important consideration during the remediation of degraded soil. The temporal variation and distribution of C and N stocks in the soil profile were studied in areas with different types of vegetation restoration in the Zhifanggou catchment of China's Loess Plateau. In this area, the "Grain-for-Green" project(GFGP) encouraged landscape scale habitat restoration during the last decade. Results showed that afforestation of degraded cropland significantly promoted CO2 sequestration and restored soil N availability, which consequently reduced N limitation and sustained C sequestration |
ISSN: | 1002-6819 |