青海湖农场退耕还林草后的土壤碳氮变化

doi:10.11733/j.issn.1007-0435.2014.03.006

草地学报 ›› 2014, Vol. 22 ›› Issue (3): 469-474.DOI: 10.11733/j.issn.1007-0435.2014.03.006

青海湖农场退耕还林草后的土壤碳氮变化

陈懂懂^1,2, 李奇^1,2, 邹小艳^1,2, 赵新全^1,2,3, 徐世晓^1,2, 蔡海⁴, 邹婧汝^1,2,5, 赵亮^1,2

1. 中国科学院西北高原生物研究所海北高寒生态系统研究站高原生物适应与进化重点实验室, 青海西宁 810008;
2. 中国科学院西北高原生物研究所, 青海西宁810008;
3. 中国科学院成都生物研究所, 四川成都 610041;
4. 武威职业学院农业经济系, 甘肃武威 733000;
5. 中国科学院大学, 北京 100001

收稿日期:2013-09-06 修回日期:2013-10-30 出版日期:2014-06-15 发布日期:2014-06-04
通讯作者: 赵亮
作者简介:陈懂懂（1982- ），女，山东广饶人，博士，助理研究员，研究方向为土壤生态学，E-mail：chendd@nwipb.cas.cn；
基金资助:
青海省科技项目（2011-Z-734）；中国科学院战略性先导科技专项（XDA05070200）；国家科技支撑计划（2012BAD13B01）；中国科学院西北高原生物研究所知识创新工程领域前沿项目（2011）；国家自然科学基金重点项目（41030105）（30770419）资助

How Did Soil Organic Carbon and Total Nitrogen Change After “Grain for Green” in the Qinghai-Lake Farm

CHEN Dong-dong^1,2, LI Qi^1,2, ZOU Xiao-yan^1,2, ZHAO Xin-uan^1,2,3, XU Shi-xiao^1,2, CAI Hai⁴, ZOU Jing-ru^1,2,5, ZHAO Liang^1,2

1. Key Laboratory of Adaptation and Evolution of Plateau Biota, Haibei Alpine Meadow Ecosystem Research Station, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;
2. Northwest Plateau Institute of Biology, the Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;
3. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan Province 610041, China;
4. Department of Agricultural Economics, Wuwei Occupational College, Wuwei, Gansu Province 733000, China;
5. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2013-09-06 Revised:2013-10-30 Online:2014-06-15 Published:2014-06-04

摘要/Abstract

摘要：

对青海湖农场退耕还林草地以及耕地和天然草地的土壤有机碳（SOC）、全氮（TN）含量及储量、无机氮（N_inorg）含量、土壤pH等基础理化指标进行了测定分析。结果表明：退耕（还林草）地与耕地和天然草地土壤均偏碱性；退耕地及天然草地土壤容重及N_inorg含量均低于耕地；退耕地和天然草地0~5 cm土层C/N显著高于耕地；退耕地和耕地0~5，5~10，10~20 cm土层的SOC和TN含量低于天然草地；退耕还林草9年后各土层SOC和TN含量与耕地相比差异不显著，说明青海湖区持续耕作60多年后，要恢复土壤肥力仍需较长时间；对于0~30 cm土层的SOC及TN储量，退耕地和天然草地与耕地无显著差异，而退耕地与天然草地之间差异显著（P<0.05）；耕地、退耕地以及天然草地0~20 cm土壤SOC含量分别占0~30 cm土层SOC储量的68.7%，72.9%和78.6%；0~20 cm土层TN含量分别占0~30 cm土层TN储量的68.7%，72.7%和78.2%；与天然草地相比，按耕地开垦60年计算，0~30 cm耕层内，C的损失率为0.11 t C·a^-1·hm^-2，N的损失率为0.015 t N·a^-1·hm^-2；土壤C和N含量与容重共同决定C和N储量的大小，因此土壤容重是影响土壤质量的重要因素之一。

关键词: 青海湖农场, 退耕还林草, 土壤碳氮储量

Abstract:

Soil physio-chemical properties of three land-use types (abandoned farmland-grain for green, cropland and natural grassland) in Qinghai-Lake farm, such as soil organic carbon (SOC), total nitrogen (TN) and inorganic nitrogen (N_inorg) concentration, pH, bulk density were determined. The results showed that three land-use types had alkaline soils. The bulk densities and N_inorg contents of abandoned farmland and grassland were lower than those of cropland. The soil C/N ratios of abandoned farmland and grassland were higher than that of cropland in 0~5 cm. The SOC & TN concentrations of abandoned farmland and cropland in 0~5 cm, 5~10 cm, and 10~20 cm layers were lower than those of natural grassland. SOC & TN concentrations only in 0~5 cm layer had a smaller increase after "grain for green" for about 10 years comparing with cropland, indicating that the recovery of soil fertility would take a longer time after continuous cultivation for more than 60 years. Both SOC and TN storages in 0~30 cm soil layer were no significant difference between cropland and abandoned farmland or grassland, while there was significant difference between abandoned farmland and grassland. The storages of TOC and TN depended on both soil nutrients and bulk densities. Therefore, soil bulk density is an important factor in the process of soil quality improvement.

Key words: Qinghai-lake farm, Grain for green, SOC and TN storage

中图分类号:

S151.9

陈懂懂, 李奇, 邹小艳, 赵新全, 徐世晓, 蔡海, 邹婧汝, 赵亮. 青海湖农场退耕还林草后的土壤碳氮变化[J]. 草地学报, 2014, 22(3): 469-474.

CHEN Dong-dong, LI Qi, ZOU Xiao-yan, ZHAO Xin-uan, XU Shi-xiao, CAI Hai, ZOU Jing-ru, ZHAO Liang. How Did Soil Organic Carbon and Total Nitrogen Change After “Grain for Green” in the Qinghai-Lake Farm[J]. Acta Agrestia Sinica, 2014, 22(3): 469-474.

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青海湖农场退耕还林草后的土壤碳氮变化

How Did Soil Organic Carbon and Total Nitrogen Change After “Grain for Green” in the Qinghai-Lake Farm

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