干旱区生态环境知识资源中心(Arid): 毛乌素沙地固沙林发育过程中土壤有机碳库稳定性特征

Arid

	毛乌素沙地固沙林发育过程中土壤有机碳库稳定性特征
其他题名	Stability characteristics of soil organic carbon pool following development of sand-fixing forest in Mu Us sandy land, China
	蒋小董 1; 郑嗣蕊 2; 杨咪咪 2; 万家鸣 2; 黄悦 2; 余可 2; 佟小刚 2
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2019
卷号	30 期号:8 页码:2567-2574
中文摘要	为揭示固沙林发育过程中土壤固碳效应与有机碳库稳定性特征,基于时空替代法,采集陕北毛乌素沙地治沙区从半固定沙地到林龄分别为22、32、53年乔木和灌木林地表层土壤,分析了土壤总有机碳、氧化活性碳和惰性有机碳含量,以及矿化碳排放、分解比例的变异特征.结果表明:相比半固定沙地,22~53年灌木和乔木林土壤总有机碳增幅来自惰性碳,分别为3.5~6.2和3.2-7.7 g · kg~(-1),来自氧化活性碳的分别为2.8~3.4和1.3~2.8 g · kg~(-1),并且灌木和乔木林土壤氧化活性碳所占比例未发生显著变化,分别维持在37.0%和26.8%,但土样经恒温培养60 d后,该比例分别下降至25.7%和17.4%.培养结束时,2种林地22~53年土壤有机碳矿化率无显著差异;所有固沙林样地矿化碳的损失有76.9%~98.7%来自于氧化活性碳,仅1.3%~23.5%来自于惰性碳.与最高碳分解速率相比,土壤碳累积释放量与beta-葡萄糖苷酶、脱氢酶活性的相关性更强,但酶活性在32~53年林地无显著差异.综上,随着固沙林林龄增加,土壤有机碳趋向少排多存碳的稳定性特征,乔木固沙林固碳效果优于灌木固沙林.
英文摘要	The study aimed to reveal the cumulative effects and stability characteristics of soil organic carbon (SOC) during forest development at the Mu Us sandy land,China. Using space for time substitution,surface soil samples were collected from semi-fixed sandy lands and restored arbor and shrub lands with the ages of 22,32 and 53 years in the Yulin sand control region in Northern Shaanxi Province. The content of total organic carbon (TOC),oxidizable labile organic carbon, and resistant carbon and the characteristics of mineralized carbon emission and decomposition ratio were analyzed. The results showed that the increment of TOC for 22 to 53 years shrub and arbor lands from resistant carbon were 3.5-6.2 g · kg~(-1) and 3.2-7.7 g · kg~(-1),and from oxidized labile carbon were 2.8-3.4 g · kg~(-1) and 1.3-2.8 g · kg~(-1),respectively, compared with semi-fixed sand land. The ratio of soil oxidizable labile carbon in shrub land and arbor land were stable and maintained at 37.0% and 26.8%, respectively. However, the ratio decreased to 25.7% and 17.4% after incubated at a constant temperature for 60 days. The mineralization rate of shrub and arbor lands with 22-53 years was not significant at the ending of soil incubation. Carbon losses from oxidized liable carbon were 76.9%-98.7%, and only 1.3%-23.5% from resistant carbon in all sand-fixing forest plots. Compared with the maximum carbon emission rate,the soil cumulative carbon release exhibited a higher correlation with soil enzyme activities of beta-glucosidase and dehydrogenase, but the enzyme activities did not change from 32-53 years. In conclusion, SOC pool showed stable characteristics of lower emission and higher sequestration with the increases of sand-fixing forest stand age. The carbon fixation effect of arbor sand-fixing forest was better than that of shrub sandfixing forest.
中文关键词	土壤有机碳 ; 碳库稳定性 ; 沙漠化逆转 ; 固沙林 ; 毛乌素沙地
英文关键词	soil organic carbon stability of carbon pool desertification reversal sand-fixing forest Mu Us sandy land
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6550012
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239680
作者单位	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, 杨凌, 陕西 712100, 中国; 2.西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国
推荐引用方式 GB/T 7714	蒋小董,郑嗣蕊,杨咪咪,等. 毛乌素沙地固沙林发育过程中土壤有机碳库稳定性特征[J]. 西北农林科技大学,2019,30(8):2567-2574.
APA	蒋小董.,郑嗣蕊.,杨咪咪.,万家鸣.,黄悦.,...&佟小刚.(2019).毛乌素沙地固沙林发育过程中土壤有机碳库稳定性特征.应用生态学报,30(8),2567-2574.
MLA	蒋小董,et al."毛乌素沙地固沙林发育过程中土壤有机碳库稳定性特征".应用生态学报 30.8(2019):2567-2574.