Results 61 to 70 of about 2,578 (179)
Shuitu Baochi Xuebao, 2008 采用烘干法及WP4水势仪对黄土高原水蚀风蚀复合区人工林下土壤重量含水量及水势进行测定,从土壤水分数量和能量两方面分析该区土壤水分时空分布和动态变化特征,并且通过实测数据对不同树种土壤水分特征曲线进行拟合,旨在为该区今后植被建设及生态用水提供理论参考。结果表明,各树种在0-300 cm土层土壤含水量随深度增加而逐渐降低,并趋于稳定。0-30 cm土层土壤含水量变化剧烈,30 cm以下土层土壤含水量逐渐降低,并趋于稳定在3.00%~5.00%。土壤水分受降雨量及其分配影响显著,观测期内土壤储水量盈余26.7
周海光 +4 more
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Shuitu Baochi Xuebao, 2021 土壤水分是黄土高原水蚀风蚀交错带生态环境恢复的关键因子，具有明显的时空异质性。以水蚀风蚀交错带的代表性流域—老爷满渠小流域为对象，采用网格法（50 m×50 m）共布设了73个样点，原位观测0—5 m土壤含水率，共测定23次（2013年6月至2019年10月），通过获取每个样点的环境因子，结合经典统计、地统计、随机森林等方法，分析了小流域尺度不同土层深度（每层1 m，共5层）土壤含水率的季节变化特征与影响因素。结果表明：不同土层土壤含水率的空间分布特征和季节性变化规律不同；对于0—1 m土层 ...
徐澜 +5 more
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DYNAMIC of NUTRIENT ELEMENTS IN LITTERFALL of SUBTROPICAL RAIN FOREST of HEXI IN FUJIAN [PDF]
, 1995 探讨了福建和溪亚热带雨林主要营养元素通过凋落物的归还动态.结果表明，该森林一年中凋落物不同组分各元素的含量具有波动性，加权平均含量为n＞k＞CA＞Mg＞P（落果CA＝Mg、落枝CA＞k）。通过凋落物归还n、P、k、CA、Mg元素的年库流量，分别为87.41、3.82、40.80、28.81和15.32kgHM（-2），灰分量为284.57kgHM（-2），其中以落叶形式居最大，分别各占总量的73.4%、68.1%、.77.2%、72.9%、74.5%和79.9 ...
林鹏, 王良睦, 邵成, 郑文教
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Shuitu Baochi Xuebao目的喀斯特区白云岩坡地植被恢复困难，石漠化治理难度大，其浅薄土层下伏的表层岩溶带深度参与生态系统过程，然而土壤与表层岩溶带二者的耦合发育关系尚不明确。方法选择典型白云岩山坡，在全坡面尺度上开展深入表层岩溶带强风化层底部的岩土探槽开挖试验，结合Kriging插值、地理加权回归分析等方法对土壤和表层岩溶带强风化层空间特征进行分析，初步探明白云岩坡地土壤与表层岩溶带强风化层间的空间耦合发育特征。结果1) 白云岩坡地土壤和表层岩溶带强风化层厚度沿坡向下逐渐增加，坡地尺度上表层岩溶带强风化层平均厚度为50 cm ...
唐旭芳 +5 more
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Ecological protection coal mining technology system and engineering practice [PDF]
In view of the large-scale and efficient coal mining in ecologically fragile areas, which causes a large scope, long cycle and high intensity of ecological impacts, and the lack of a systematic technology that integrates the whole cycle of mining, source
Jie FANG +6 more
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[Determination of 14 aniline and benzidine compounds in soil by gas chromatography-mass spectrometry]. [PDF]
Se Pu, 2023 Wu L +5 more
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Characteristics of groundwater circulation in typical karst trough areas：A case study of Longtan trough valley in Youyang, Chongqing [PDF]
Although the southwest karst valley region of China has an abundance of groundwater resources, little is known about the variations in the karst trough valley’s groundwater types and their cycle features. Using the Chongqing Youyang Longtan trough valley
Lian LI +4 more
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[Chemical diversity of dissolved organic matter revealed by ultra performance liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometry]. [PDF]
Se Pu, 2023 Ma C, Ni HX, Qi YL.
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Shuitu Baochi Xuebao, 2023 明确黄土丘陵区降雨对土壤水分影响,对准确评估降雨格局变化对生态系统结构和功能的影响具有重要意义。以陕北黄土丘陵区退耕地栽植后自然撂荒23年的柠条人工纯林为研究对象,通过土壤湿度传感器监测不同土层土壤体积含水量,探讨不同土层土壤水分补充增量对降雨特征(降雨量、降雨历时和降雨强度)的响应。结果表明:(1)土壤水分消耗和补充主要集中于0-500 cm土层,其月变化在垂直剖面呈"双峰"(4—5月)、"单峰"(6月)和"双峰"(7—10月),随土层深度增加变化率减弱;(2)当降雨量>4 ...
孙亚荣 +6 more
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Hydroecological effects of mining and its restoration ways in coal mining areas of Western China [PDF]
The mining areas in arid and semi-arid region have become important coal production bases to ensure China’s energy strategic security, however, coal development by large-scale and high-intensity mining has triggered a series of water resources and ...
Guangrong GE +7 more
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