毛乌素沙地沙漠化逆转过程土壤颗粒固碳效应

doi:10.13287/j.1001-9332.201611.022

应用生态学报 ›› 2016, Vol. 27 ›› Issue (11): 3487-3494.doi: 10.13287/j.1001-9332.201611.022

毛乌素沙地沙漠化逆转过程土壤颗粒固碳效应

马建业¹, 佟小刚^2*, 李占斌³, 付广军⁴, 李娇², 哈斯尔²

¹西北农林科技大学水土保持研究所/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西北农林科技大学资源环境学院, 陕西杨凌 712100;
³中国科学院水利部水土保持研究所, 陕西杨凌 712100;
⁴陕西省治沙研究所, 陕西榆林 719000

收稿日期:2016-05-12 出版日期:2016-11-18 发布日期:2016-11-18
通讯作者: E-mail: xiaogangtong@126.com
作者简介:马建业, 男, 1995年生, 硕士研究生. 主要从事水土保持研究. E-mail: majianye126@126.com
基金资助:
本文由国家自然科学基金项目(41301602)、国家自然科学基金重点项目(41330858)和中央高校基本科研业务费专项(2452015350)资助

Carbon sequestration in soil particle-sized fractions during reversion of desertification at Mu Us Sand land.

MA Jian-ye¹, TONG Xiao-gang², LI Zhan-bin³, FU Guang-jun⁴, LI Jiao², Hasier²

¹Institute of Soil and Water Conservation, Northwest A&F University/State Key Laboratory of Soil Erosion and Dry Land Farming on the Loess Plateau, Yangling 712100, Shaanxi, China;
²College of Nature Resource and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;
³Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China;
⁴Desert Control Research Institute of Shaanxi Province, Yulin 719000, Shaanxi, China

Received:2016-05-12 Online:2016-11-18 Published:2016-11-18
Contact: E-mail: xiaogangtong@126.com
Supported by:
This work was supported by the National Natural Science Foundation of China (41301602), the Major Program of National Natural Science Foundation of China (41330858) and the Fundamental Research Funds for the Central Universities (2452015350).

摘要/Abstract

摘要： 为揭示毛乌素沙地沙漠化逆转过程中土壤颗粒的固碳效应,选择陕北榆林治沙区从流沙地、半固定沙地到林龄为20～55年生的灌木和20～50年生的乔木固沙林地,采用物理分组法分析了土壤砂粒、粉粒、黏粒结合碳的演变特征和累积速率.结果表明: 对比流沙地,土壤总有机碳及各颗粒碳含量在两种固沙林地均呈显著增加趋势,并以表层0～5 cm土壤碳含量增幅最高.从流沙地到55年生灌木和50年生乔木固沙林地,0～5 cm土层砂粒碳密度增速均为0.05 Mg·hm^-2·a^-1,粉粒碳密度增速分别为0.05和0.08 Mg·hm^-2·a^-1,而黏粒碳密度增速分别为0.02和0.03 Mg·hm^-2·a^-1.0～20 cm土层,两种林地各颗粒碳密度增速平均为0～5 cm土层的2.1倍.按此增速到50～55年生的固沙林地时,两种林地0～20 cm土层的砂粒碳、粉粒碳和黏粒碳密度分别比流沙地平均提高6.7、18.1、4.4倍,并且颗粒碳对总有机碳的累积贡献率平均为粉粒碳(39.7%)≈砂粒碳(34.6%)>黏粒碳(25.6%).综上,毛乌素沙地沙漠化逆转过程土壤颗粒均表现出显著的固碳效应,且以砂粒和粉粒为主要固碳组分.

关键词: 沙漠化逆转, 土壤有机碳, 固碳, 土壤颗粒

Abstract: The aim of this study was to investigate the effects of carbon sequestration in soil particle-sized fractions during reversion of desertification at Mu Us Sand Land, soil samples were collected from quicksand land, semifixed sand and fixed sand lands that were established by the shrub for 20-55 year-old and the arbor for 20-50 year-old at sand control region of Yulin in Northern Shaanxi Province. The dynamics and sequestration rate of soil organic carbon (SOC) associated with sand, silt and clay were measured by physical fractionation method. The results indicated that, compared with quicksand area, the carbon content in total SOC and all soil particle-sized fractions at bothsand-fixing sand forest lands showed a significant increasing trend, and the maximum carbon content was observed in the top layer of soils. From quicksand to fixed sand land with 55-year-old shrub and 50-year-old arbor, the annual sequestration rate of carbon stock in 0-5 cm soil depth was same in silt by 0.05 Mg·hm^-2·a^-1. The increase rate of carbon sequestration in sand was 0.05 and 0.08 Mg·hm^-2·a^-1, and in clay was 0.02 and 0.03 Mg·hm^-2·a^-1 at shrubs and arbors land, respectively. The increase rate of carbon sequestration in 0-20 cm soil layer for all the soil particles was averagely 2.1 times as that of 0-5 cm. At the annual increase rate of carbon, the stock of carbon in sand, silt and clay at the two fixed sand lands were increased by 6.7, 18.1 and 4.4 times after 50-55 year-old reversion of quicksand land to fixed sand. In addition, the average percentages that contributed to accumulation of total SOC by different particles in 0-20 cm soil were in the order of silt carbon (39.7%)≈sand carbon (34.6%) > clay carbon (25.6%). Generally, the soil particle-sized fractions had great carbon sequestration potential during reversion of desertification in Mu Us Sand Land, and the slit and sand were the main fractions for carbon sequestration at both fixed sand lands.

Key words: soil organic carbon, reversion of desertification, carbon sequestration, soil particle

马建业, 佟小刚, 李占斌, 付广军, 李娇, 哈斯尔. 毛乌素沙地沙漠化逆转过程土壤颗粒固碳效应[J]. 应用生态学报, 2016, 27(11): 3487-3494.

MA Jian-ye, TONG Xiao-gang, LI Zhan-bin, FU Guang-jun, LI Jiao, Hasier. Carbon sequestration in soil particle-sized fractions during reversion of desertification at Mu Us Sand land.[J]. Chinese Journal of Applied Ecology, 2016, 27(11): 3487-3494.

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毛乌素沙地沙漠化逆转过程土壤颗粒固碳效应

Carbon sequestration in soil particle-sized fractions during reversion of desertification at Mu Us Sand land.

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