Results 21 to 30 of about 97 (78)
长期氮沉降和地上凋落物处理对半干旱区沙质草地表层土壤碳氮组分的影响
Shuitu Baochi Xuebao, 2023 为揭示半干旱区沙质草地生态系统中表层土壤C、N组分对长期氮添加和地上凋落物处理的响应特征,以科尔沁沙地西南部国家野外科学观测研究站建立的长期(9年)氮添加和凋落物处理样地为平台,测定并分析该样地表层土壤环境因子、铵态氮、硝态氮、总有机碳、不同碳氮组分。结果表明:(1)持续9年的氮添加和地上凋落物处理对表层土壤环境因子和不同碳氮组分无交互作用;(2)氮添加处理显著降低土壤pH ...
詹瑾 +8 more
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Shuitu Baochi Xuebao, 2005 对科尔沁沙地不同沙漠化阶段土壤有机碳、全氮含量、土壤质地以及碳氮密度进行了测定与分析。结果表明,沙漠化过程中不同阶段的特征体现在土壤碳、氮、颗粒组成的有规律变化,土壤碳、氮含量衰减,质地变粗;从潜在沙漠化阶段到严重沙漠化阶段,100 cm深土壤有机碳和全氮含量分别下降91.6%和85.8%,有机碳密度从4 877.9(C)g/m2下降到481.8(C)g/m2,全氮密度从518.0(N)g/m2下降到89.4(N)g/m2;土壤有机碳、全氮与土壤细颗粒组分(
李玉强 赵哈林 赵学勇 张铜会 移小勇 左小安
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Exploration on the surface water leakage mechanism of travertine pools in Salix cupularis shrub area of Huanglong Scenic Spot, Sichuan Province [PDF]
Recently, some travertine landscape groups in Huanglong Scenic Spot have been degraded to varying degrees. Surface water leakage, blackening and desertification have occurred on a large scale in the dense distribution area of Salix cupularis shrub, which
Dong SUN +8 more
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Transformation of Stock Farming Production Practices in the Horqin District of Inner Mongolia －Case Study of the Agropastoral Village Dalanail Gacha－ [PDF]
, 2020 ホルチンという言葉は本来モンゴル遊牧民の中の一部族であるホルチン部を指してきたが、徐々にホルチン部族が生活する地域を「ホルチン地区」と呼ぶようになった。特に中華人民共和国の成立後、興安嶺の東南麓に位置する内モンゴル自治区東部の通遼市を中心として指すようになった。 ホルチン地域は清朝時代の移民開墾を経て、農耕を中心とするようになり、モンゴル人の半農半牧村落社会が形成された。モンゴル人総人口の80％ 以上はこの東部地域に居住し、主に農業と「半農・半牧」生業を営んでいる。西部地域は、主に牧畜業を営み ...
包 周娜
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The effects of drought stress on the stoichiometric characteristics of C, N, and P in Pinus yunnanensis seedlings [PDF]
[Objective] This study aims to investigate the effects of drought stress on the distribution of carbon (C), nitrogen (N), and phosphorus (P) elements and stoichiometry in organs of Pinus yunnanensis seedlings, and to provide a theoretical basis for ...
CHEN Gang +5 more
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Effects of different land use types on soil structure and hydraulic characteristics of reclaimed coal mines in semi-arid areas [PDF]
In order to explore the water characteristics of soil in reclaimed coal mines in semi-arid areas and make better use of the land in reclaimed mining areas, the basic physical properties, water characteristic curves, unsaturated water conductivity and ...
Duomei LI +5 more
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, 2014 契丹辽朝虽然是游牧民族建立的封建王朝,但早已在其前史中就开始接触州县行政了。循契丹辽朝州县建置的发展脉络,以州县人口来源为根据,契丹辽朝州县大体可分为移民州县、燕云接收州县和边防城三类。契丹辽朝移民州县的设置和燕云州县的整体接收,巧妙地解决了原有部落组织的保留与中原州县行政的移植之间的尖锐矛盾,从而充分地体现了契丹辽朝“因俗而治“的统治策略,而且透视出国家经济一体化的形成轨迹。厦门大学985工程重点学科“马克思主义理论 ...
王明前
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Remote sensing monitoring of vegetation restoration effect based on NDVI time series data in Muli Coalfield of Qinghai Province [PDF]
The illegal mining activities in the Muli Coalfield have severely damaged the ecological environment of the Qilian Mountains, which has aroused great concern of the Party Central Committee.
Junsheng LIU +5 more
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Shuitu Baochi Xuebao, 2007 通过野外取样和室内分析,初步研究了科尔沁沙地植被恢复过程中结皮的理化性质及其结皮发育对下层土壤特性的影响。结果表明,半流动、半固定和固定沙丘分别发育了物理、地衣及苔藓结皮,结皮的厚度、紧实度、水分、粘粉粒含量及各种全效、速效养分随沙漠化逆转趋势依次增加。同时,结皮的存在增加了其下层土壤的容重值,提高了颗粒组成中的极细砂和粘粉粒含量,富集了结皮下土壤的有机质、全N、全P、速效N、速效P等养分,随着结皮的发育,结皮对下层土壤的上述影响作用从半流动沙丘到半固定、固定沙地呈逐渐增长的趋势。沙漠化逆转过程中 ...
郭轶瑞 +4 more
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