Results 31 to 40 of about 9,014 (169)
Mycorrhiza‐induced alterations in the spatial structure of stands in a subtropical forest
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Spatial aggregation patterns represent snapshots of ecological processes that occurred over an extensive period. Such processes can shape both the conspecific and the heterospecific spatial structure of plants across woody habitats.
Jingjing Xi +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2007 采用地统计学的方法,研究了江西泰和退化红壤区不同模式重建森林在高温干旱季节土壤水分空间变异规律及其分布格局。结果表明,在该研究尺度下,湿地松纯林、枫香纯林、湿地松与枫香混交林0~20 cm,20~40cm土层含水量分布都符合正态分布,都可较好地拟合成球状模型,表现出明显的空间相关性和空间分布格局。3种重建模式样地0~20 cm,20~40 cm层土壤含水量变异函数的基台值、变程都较无林荒地明显增大,而且基台值和变程在0~20 cm,20~40 cm两土层间的差异明显大于无林荒地,说明植被恢复以后 ...
杜志勇 +3 more
doaj +2 more sources
健康小鼠进食绣球菌对腹腔巨噬细胞分泌肿瘤坏死因子α的影响 [PDF]
, 2018 测定健康小鼠进食绣球菌对腹腔巨噬细胞分泌肿瘤坏死因子α(TNF-α)的影响.SPF级Balb/C健康小鼠分组进食普通饲料、分别含绣球菌饲料、干品、浸汁饮水或其添加物组合、分别含酵母β-葡聚糖饲料、浸汁饮水或其添加物组合;进食一定时间后,分离腹腔巨噬细胞,使用含质量分数10%胎牛血清的RPMI1640培养液培养,TNF-α试剂盒检测上清液中的TNF-α质量浓度.结果表明,强化进食绣球菌组合(绣球菌饲料+干品+浸汁)的小鼠与对照组或酵母β-葡聚糖组合(酵母β-葡聚糖饲料+浸汁)小鼠相比,体质量不升反降 ...
张鸣青 +6 more
core
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Organic phosphorus mineralization is a critical process in the phosphorus cycle, governing phosphorus bioavailability for plants. The PhoD gene, which encodes the key enzyme alkaline phosphatase, serves as a valuable biomarker for this process.
Sandhya Mishra +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2001 湿地土壤养分是时空连续的变异体,不论尺度大小均具有高度的空间异质性.湿地土壤养分变量属于区域化变量,同时具有随机性和结构性,仅运用经典的Fister统计方法已经不能满足土壤空间异质性研究的需要.地统计学是近几十年发展起来的一门新的空间分析方法,其变异函数则适合于定量研究区域化变量空间结构变异特征,能够全面反映区域化变量的结构性.作者在前人的工作基础上意欲用地统计学的区域化变量理论和变异函数对湿地土壤养分的空间异质性进行定量研究,并对其研究方法进行了构想.＃
白军红 余国营 张玉霞
doaj
Testing AnnAGNPS for water quality modelling in the typical sub-watersheds in Jiulong River watershed [PDF]
, 2005 在中国东南丘陵山区一中尺度流域———九龙江流域选取4个土地利用方式不一的典型小流域,借助GIS和相关资料率定模型参数,并通过对2003年4月至9月各小流域出口降雨水质水量的同步监测,检验了连续分布式参数模型(AnnualizedAGriculturalNonPointSourceModel,AnnAGNPS)的适用性.研究结果表明,模型对于地表径流量的模拟能力好于对泥沙和营养盐的模拟,对总磷和泥沙输出的模拟结果表现出了较大的不确定性.
张珞平 +3 more
core
Research progress on the application and development of the material point method in dynamic simulation of geological hazards [PDF]
Numerical simulation is commonly used to address large deformation geological disasters such as collapses, landslides, and debris flows. Accurately and efficiently simulating these issues has always been a challenge.
Bin LI +4 more
core +1 more source
Success of restoration strategies in preventing extirpation of 2 critically endangered coral species
Conservation Biology, EarlyView.Abstract An unprecedented marine heatwave in 2023 caused widespread coral bleaching and mortality throughout the Caribbean. In the Florida Keys (USA), 2 foundation species, elkhorn coral (Acropora palmata) and staghorn coral (Acropora cervicornis), were severely affected.
Erinn M. Muller +29 more
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为研究小流域尺度下土壤有机碳的变异规律，运用地统计学方法对研究区0—10，10—20，20—40 cm土壤有机碳含量的空间变异性进行了研究。结果表明：流域内不同土层有机碳含量属于中等强度变异，具有强烈的空间自相关性；土壤有机碳含量在0，135°方向上空间变异程度明显，空间分布的各向异性显著；克里格插值结果显示流域内阴坡土壤有机碳含量明显高于阳坡，高海拔区域土壤有机碳含量高于低海拔区域；不同土层间，土壤有机碳含量均表现为青海云杉 > 灌丛 > 草地，表明不同植被类型对土壤有机碳含量和分布有着重要影响 ...
芦倩, 李毅, 刘贤德, 赵维俊
doaj
Characteristics and Drivers of Spatial and Temporal Soil Erosion in Anshun City, Karst Region [PDF]
[Objective] To explore the spatial and temporal evolution of soil erosion in Anshun City, southwest karst region, as well as the main controlling factors of soil erosion, and to master the soil erosion situation in the region, in order to help the ...
LI Yuan, LIU Ziqi, WU Wenxian
core +1 more source