Results 61 to 70 of about 23,362 (181)
Shuitu Baochi Xuebao, 2023 为探究贵州表层土壤有机质的空间变异特征及其主要影响因素,使用贵州省第二次土壤普查资料中193个土壤剖面数据,结合贵州省气象资料、土地利用类型图及土壤类型图等资料,运用地统计学和多元回归分析各因素对表层土壤有机质空间变异的解释能力。结果表明:(1)贵州省表层土壤有机质含量范围为0.05%~36.68%,平均含量为5.23%±4.96%,变异系数为94.90%;(2)表层土壤有机质在空间分布上表现出东北部高,西南部较低的格局;(3)半变异函数分析表明,贵州省土壤有机质主要受自然因素影响,海拔、CEC ...
文鑫 +4 more
doaj
, 2012 沉积物疏浚是削减富营养化湖泊内源负荷的最为直接和有效的手段。分析了沉积物疏浚的效果和可能引起的风险;从外源污染、作业区域和深度、沉水植物3个方面探讨了影响沉积物疏浚效果的关键因素。最后指出,富营养化湖泊沉积物疏浚的重要原则是截断外源污染、划分作业区域、合理控制挖掘深度、创造适宜生境、恢复沉水植物 ...
刘华丽 +3 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
The compositions, sources, distribution and biogeochemical significance of particles in the Northern South China Sea [PDF]
, 2016 海水颗粒物是诸多海洋生物地球化学过程的关键环节之一，其量变涉及到一系列复杂的生物、物理、化学及地质过程。然而，迄今为止，世界范围内，人们对于海洋中颗粒物的组成、来源、时空变化及其控制因素等均缺乏清晰的了解和认识。有鉴于此，本研究对2014年春季采于南海北部5个站位、包含平面与垂向的21个样品中的颗粒物进行了单颗粒法研究(扫描电镜+能谱)。在31267个颗粒形貌及其元素组成特征的研究基础之上，鉴别出生物有机质碎屑、硅质生物碎屑、完整硅质生物、钙质生物碎屑、完整钙质生物、二氧化硅和硅酸盐、重金属 ...
徐泽兰
core
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Stand functional diversity (RaoQ) and stand functional composition in terms of the functional traits of the component species (CWM trait) are critical for ecosystem processes and functioning, such as litter decomposition and associated nutrient cycling.
Bai‐Yu Yang +12 more
wiley +1 more source
Study on the microbial community structure, diversity and abundance in water-soil interface sediments on the watershed of three rivers [PDF]
, 2013 为了探讨无机盐分、养分及有机质矿化作用对微生物群落结构、多样性和功能微生物丰度影响，河流水土界面微生物群落结构和碳、氮、硫循环功能微生物种群的演替规律，本论文以九龙江、闽江和瓯江三江流域作为研究区域，并增加温室培养实验，对其中水土界面沉积物样品中的理化参数、微生物群落、多样性和功能微生物丰度进行测定；采用基因文库构建技术、变性梯度凝胶电泳技术（DGGE）和illumina高通量测序技术分析了样品中微生物群落结构及活动规律；利用实时荧光定量PCR（RT-PCR）技术对功能微生物进行定量 ...
李虎
core
Hobbyist preferences for pet freshwater turtles
Conservation Biology, EarlyView.Abstract The burgeoning pet trade is a primary threat to wild freshwater turtles worldwide. Although the risks from commercial exploitation of turtles have been discussed widely, there is little empirical research on preferences for pet turtles from a hobbyists’ perspective.
Jingjing Zhao +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 采用联合测定法和光散射技术分别研究了有机质对土壤颗粒表面电荷性质和水体中胶体颗粒凝聚过程的影响。结果表明：添加有机质能显著改变土壤表面电荷性质，使得土壤颗粒表面电荷数量降低6.8%，比表面积增加12.3%，使颗粒表面电荷密度减小，表面电位降低；进一步理论计算表明添加有机质降低了胶体颗粒间的静电排斥力，使得净引力增大，胶体颗粒更易发生凝聚。通过动态光散射分析水体中土壤胶体颗粒的凝聚特征，发现有机质去除前后的临界聚沉浓度(CCC)分别为91.6 mmol/L和139.3 mmol/L ...
丁武泉, 何家洪
doaj
Conservation Biology, EarlyView.Abstract Consumer demand for ivory perpetuates the unsustainable and illegal killing of African elephants and other wildlife species. Interventions that aim to change consumer behavior are increasingly recognized as a crucial element of demand management. However, poor design and implementation have limited their effectiveness.
Molly R. C. Brown +2 more
wiley +1 more source
Investigation on the characteristics of algal-derived autochthonous DOM and effects of it on the binding behavior with PAHs using spectroscopy [PDF]
, 2016 溶解性有机质（DissolvedOrganicMatter，DOM）是水环境中一类复杂的溶解性有机混合物，按其来源可分为内源性和外源性DOM[1]。藻类（本文主要指代微藻）内源性DOM是水中DOM主要来源，其在生源要素的生物地球化学循环过程中起重要作用[2]。多环芳烃（PolycyclicAromaticHydrocarbons，PAHs）是一类在环境中广泛分布的持久性有机污染物，其可对藻类生长及代谢产生毒害作用，但有关PAHs对藻类释放内源性DOM的影响研究鲜见报道。此外 ...
杨承虎
core