Results 71 to 80 of about 808 (153)

HYDROLOGICAL OBSERVATION IN AN EVERGREEN BROAD LEAVED FOREST IN THE WUYI MOUNTAINS [PDF]

open access: yes, 1997
[中文文摘]对武夷山甜槠林成熟林水文学效应的研究结果表明:观测期间,年大气降水量2678.78mm,林内雨量2182.04mm,林冠截留量为496.74mm;林内雨中,穿透雨量2082.08mm,树干茎流99.96mm;到达甜槠林地作用面的林内雨量中,被地表枯枝落叶层截留的雨量为159.84mm,地表径流量11.6mm,地下渗流量109.32mm,其余林内雨量形成土壤含水量增量并由地表物理蒸发、根系吸收以及植物蒸腾所消耗;甜槠林地o~200cm土层水分初渗率78.6mm·min-1,稳渗率15.5mm ...
何建源(福建武夷山国家级自然保护区管理局)   +7 more
core  

黄土的大孔隙特征和大孔隙流研究

open access: yesShuitu Baochi Xuebao, 2003
介绍了大孔隙流的概念和研究进展,对大孔隙的类型和在水文学上的分类方法进行了分析,并对大孔隙在土壤水分运动中的作用以及理论模式进行了探讨,分析了黄土的大孔隙发育特征和类型。论述了黄土区大孔隙流研究的必要性。
张建丰 林性粹 王文焰
doaj   +2 more sources

覆草对杏园土壤物理性状、肥力及果实产量与品质的影响

open access: yesShuitu Baochi Xuebao, 2004
在杏园进行覆草对土壤肥力和杏产量与品质的影响研究表明:覆草能有效地稳定土壤温度,保持和提高土壤水分;降低土壤容重,增加土壤总孔隙度和通气孔度.减少无效孔度;增加土壤有机质和养分含量,改善果树营养,提高杏产量和品质。
刘建新
doaj   +2 more sources

[Applications of functional materials-based solid phase microextraction technique in forensic science]. [PDF]

open access: yesSe Pu, 2023
Xie WY   +8 more
europepmc   +1 more source

Correlation between soil-water characteristic curve and collapsibility in undisturbed loess [PDF]

open access: yes
This study investigates the correlation between the soil-water characteristic curve (SWCC) of undisturbed loess and its collapsibility. Undisturbed loess soil samples, obtained from depths up to 30 meters below the surface in Chang’an District, Xi’an ...
Haiman WANG   +3 more
core   +1 more source

川西亚高山次生林恢复过程中土壤物理性质及水源涵养效应

open access: yesShuitu Baochi Xuebao, 2019
川西亚高山原始针叶林遭受大规模采伐后自然恢复形成的次生林已成为该区域的主要森林类型之一,也是我国西南林区水源涵养林的重要组成部分。现有亚高山森林水源涵养功能研究主要集中在暗针叶林,对天然次生林关注较少。选择川西米亚罗林区亚高山次生林自然恢复演替序列上高山柳灌丛、次生桦木阔叶林、岷江冷杉桦木针阔混交林,以相邻岷江冷杉成熟林为对照,采用空间代替时间的方法,基于土壤容重、孔隙度、持水性能等测定,分析了次生林恢复过程中土壤物理性质变化及土壤水源涵养效应动态,结果表明:(1)次生林恢复过程中 ...
朱万泽, 盛哲良, 舒树淼
doaj  

[Recent advances in the use of graphene for sample preparation]. [PDF]

open access: yesSe Pu, 2022
Feng J   +5 more
europepmc   +1 more source

Spatial-temporal Patterns and Factors of Soil Moisture in the Middle Reaches of the Yellow River under Changing Environments [PDF]

open access: yes
[Objective] To identify the main driving factors of soil moisture in the middle reaches of the Yellow River, to analyze the impact of land cover and climate change on soil moisture changes in the middle reaches of the Yellow River, and to provide a ...
HAN Qinggong   +3 more
core   +1 more source

Properties of ecological environment damage and their mechanism of restoration in arid and semi-arid coal mining area of western China [PDF]

open access: yes
The focus of coal development in China has been strategically shifted westward. That realize green mining of coal resources and coordinated ecological development becomes one of the important measures to ensure national energy security.
Suping PENG, Yinli BI
core   +1 more source

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