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题名	干旱荒漠区新垦土地土壤碳库研究
作者	雷春英
学位类别	硕士
答辩日期	2007
授予单位	中国科学院．新疆生态与地理研究所
导师	田长彦，中国科学院新疆生态与地理研究所
关键词	干旱荒漠区
其他题名	Study on Soil C Pool in Newly Cultivated Field in Arid Desert Zone
中文摘要	全球已知碳汇与已知碳源之间的无法平衡，存在一个很大的失踪的碳汇。有学者认为失踪的碳汇可能就存在于土壤圈中，或矿质碳库有可能解释当前失踪的碳汇之谜，以及改变土地管理方式有助于退化的半干旱农田生态系统由CO2源转变成CO2弱汇。 本文以干旱区荒漠新垦土地——克拉玛依市生态农业开发区为例，以时空替代法，研究干旱区荒漠新垦土地土壤有机碳、土壤活性有机碳和土壤无机碳在不同土地覆被变化下的差异，探讨干旱区荒漠土地开垦后土壤碳库的变化。结果显示，荒漠土地开垦为农田促进了土壤的碳汇效应，但秋翻的耕作措施不利于表层有机碳的固定；利用年限满6年的农田，不同种植制度对土壤有机碳的影响不同，苜蓿5年—棉花1年轮作地含量最高，棉花6年连作地最低，接近荒漠土地开垦前水平；随着开垦年限的增加土壤有机碳逐渐增高，但增量微弱，且开垦时间低于四年的土壤有机碳含量仍位于开垦前土壤有机碳含量的低值区间；农田中土壤有机碳含量及累积率、活性有机碳及碳库管理指数均高于林地，说明在干旱区农业利用比林业利用更有利于土壤碳库的积累；该区域土壤碳库以土壤无机碳库为主，土壤无机碳库占土壤碳库的77.28%；新垦土地1m深度内，土壤碳储量为240.9MgC/ha。In the global C cycle, know quantity Carbon Sink with the unable balance between known quantities Carbon source, existence hugeness missing C sink. Because of soil C pool hugeness and complexity studying, have scholar think that missing C sink to may be exist in soil pedosphere, or the mineral C pool is making an explanation missing C sink riddle, and altered land management could contribute to transforming degraded semiarid agrogecosystems from a source to a weak sink for atmospheric CO2. This article based on the new cultivated land of arid desert zone ——taking the Karamay Agroecosystem Developing Area by space-time substitution means as sample. The article research the following contents: study on the soil organic carbon, the inorganic carbon and the difference among different lies with land cover changes, the soil was got in the new cultivated land of arid desert zone. And at the same time, this article throws light on the law of C sink change after the land of arid desert zone being cultivated. The results as follows: The effects of farmland soil C sink was prompt by cultivated the land of desert, But the measures of fall turned farming was not conducive to the surface organic carbon fixation; For the farmland used constantly for six years, different cropping systems make different effects on soil organic carbon. The farmland related to planting alfalfa for five years and planting cotton for one year, which has the highest content of C pool, and the lowest content of C pool close to the level of the former desert land was belong to the farmland being plant cotton for six years; The content of soil organic carbon gradually increased along with the increase of reclamation age, but the incremental was weak. The soil organic carbon content of farmland used less than four years was still in the low range of the former cultivation farmland; The organic carbon of farmland soil , organic active carbon and carbon pool management index is higher than woodland, which illustrate that the agriculture in arid areas was more advantage to accumulate the organic C pool than forestry ; The C pool of this area is dominated by inorganic C pool, which accounts for almost 77.28%; The C pool of new cultivated farmland is 240.9MgC/ha .
语种	中文
学科主题	农学
公开日期	2010-11-12
页码	共57页
内容类型	学位论文
源URL	[http://ir.xjlas.org/handle/365004/7942]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	雷春英. 干旱荒漠区新垦土地土壤碳库研究[D]. 中国科学院．新疆生态与地理研究所. 2007.

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