Results 21 to 30 of about 174 (104)
Effects of Different Crust Types on Soil Aggregates and Organic Carbon of Vegetated Concrete Substrates [PDF]
, 2023 [Objective] The distribution of soil aggregates and the characteristics of organic carbon content were analyzed to determine the influence of biological crust on slope stability and nutrient retention in order to provide a reference and guidance for the ...
Ai Shangjin +6 more
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Characteristics of Sand-driving Wind Regime and Sediment Transport at Northeast Edge of Bayan Wendur Desert [PDF]
, 2023 [Objective] The characteristics of sand-driving wind and sand-transporting potential are the key indexes for evaluating the regional wind energy environment.
Dang Xiaohong +5 more
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Effects of Grazing Intensity on Features of Vegetation, Soil and Its Erosion in a Steppe Desert [PDF]
, 2022 [Objective] The effects of different grazing intensity on vegetation features, soil physical properties, and soil erosion in a steppe desert were determined in order to provide a scientific basis for soil erosion control, degradation and ecosystem ...
Guo Jianying, Yang Yanan, Yang Zhenqi
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Shuitu Baochi Xuebao, 2007 选取小叶锦鸡儿、山杏、杨树和差巴嘎蒿4种典型人工固沙群落为研究对象,以半流动沙丘为对照,对土壤养分含量、微生物量和主要酶的活性进行了对比研究。结果表明,4种固沙植物均能明显改善土壤C、N、P、K和微生物量C、N含量,提高土壤水解酶和氧化还原酶的活性,尤其是对土壤表层0-10 cm的改良效果更加明显。其中小叶锦鸡儿群落0-30 cm土层内微生物量C、N含量、脲酶、磷酸单酯酶、蔗糖酶、蛋白酶、脱氢酶和硝酸还原酶的活性以及有机质、N、P、K等养分含量明显高于其它3种植物群落,表现出强大的改善沙土环境的能力 ...
曹成有 +4 more
doaj +3 more sources
Spatiotemporal Evolution and Simulation of Future Landscape Patterns in Zhangjiajie City [PDF]
, 2022 [Objective] The evolution characteristics of land use and landscape patterns from 2000 to 2020 and 2030 at Zhangjiajie City, Hu'nan Province were analyzed in order to propose an optimization strategy for future development of Zhangjiajie City, and to ...
Li Yuefeng +3 more
core +1 more source
Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model [PDF]
, 2023 [Objective] The dynamic characteristics of soil moisture under different land preparation measures were analyzed in order to provide a scientific basis for assessing the eco-hydrological benefits of slope land preparations and for promoting vegetation ...
Dong Hongxia, Wei Qiang, Zhang Qindi
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沙漠化过程中沙质旱作农田土壤环境的变化及其对生产力形成的影响
Shuitu Baochi Xuebao, 2002 以地处半干旱风沙区的科尔沁沙地为对象,研究了沙漠化过程中旱作农田土壤环境的变化规律及其与生产力形成的关系。结果表明,随着农田的风蚀,土壤发生粗化,土壤环境明显恶化,导致生物产量大幅度下降。其中,严重沙漠化农田和非沙漠化农田相比,其土壤粘粒、有机质、水分、全养分、速效养分、生物量及光合效率分别下降84.3%,65.5%,74.8%,9.25%～72.8%,27.5%～69.0%,60.5%,56.8%,地温升高0.9℃。相关分析表明,土壤粘粒和有机质的吹蚀是导致土壤含水量下降的主要原因(相关系数分别为0 ...
赵哈林 赵学勇 等
doaj +2 more sources
砂漠化対処による土地利用と植生景観の変化が地域住民の生態系サービスへの認識に与える影響 [PDF]
, 2017 学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 大黒 俊哉, 東京大学准教授 橋本 禅, 東京大学客員准教授 齊藤 修, 東京大学教授 下村 彰男, 岩手大学准教授 原科 幸爾University of Tokyo ...
CAO PENG, 曹 鵬
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古尔班通古特沙漠1970—2000年代生物结皮覆盖变化研究 [PDF]
, 2006 生物结皮是古尔班通古特沙漠主要的地表覆盖类型,也是维持其地表稳定的重要生物因子。论文利用20世纪70年代中期、80年代末期及21世纪初的遥感影像,通过生物结皮指数提取了古尔班通古特沙漠在相应时期内的生物结皮空间分布。在此基础上,分析了研究区近30年来生物结皮空间分布的变化特征;利用景观分析软件Fragstats计算了各个时期内结皮覆盖的景观指数熏并对其变化特征进行了分析。结果表明:由于新疆气候增湿、增暖明显,近30年来结皮发育良好。但由于油田开采、水利工程建设、牲畜放牧等人类活动的加强 ...
张元明, 杨伟, 王雪芹, 陈晋
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, 2015 契丹辽朝的国家经济区域整合,在先后经历了对上京道契丹本部的移民开发、对辽东地区移民的农业恢复以及接收燕云地区后实施的劝农政策,为契丹辽朝在各地区区域经济发展,并发挥各自比较优势的基础上,实现国家经济区域整合准备了条件。中京的营建成为这一进程的开始和契机。随着澶渊之盟后整个国家将主要精力转向和平建设,国家政治方向从对外扩张转向内敛,各经济区域之间的整合趋势日益加强。中京的营建促进了以五京所置财赋机构为管理手段的国家宏观管理经济的行政格局的形成。在国内商业体系逐渐完备的同时 ...
王明前
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