Results 71 to 80 of about 5,920 (160)
Identification and Evaluation of Resistance of Different Litchi Cultivars to Anthracnose [PDF]
【Objective】The study aims to identify the species and dominant physiological races of Colletotrichum causing anthracnose in litchi in Maoming, and to evaluate the resistance of 28 main litchi cultivars grown locally to anthracnose, providing scientific ...
Chao SHEN +9 more
core +1 more source
晋西北丘陵风沙区50年林龄人工柠条林植被群落及其土壤特性变化
Shuitu Baochi Xuebao, 2022 为探究晋西北丘陵风沙区50年林龄人工柠条林植被群落特征及土壤环境因子的变化规律。在0(撂荒地), 12, 18, 40, 50年的时间序列上, 分析柠条生长性状、土壤含水量、土壤养分及植物群落特征等变化动态。结果表明: (1)随着人工柠条林种植年限的增加, 柠条盖度和株高在时间梯度上显著增加, 具体表现为, 种植后期(40~50年)的柠条盖度是种植前期(0~12年)的1.98倍, 柠条株高在种植后期(40~50年)是种植前期(0~12年)的1.48倍; 柠条密度随种植年限的增加而显著降低, 从种植前期 ...
刘婧 +4 more
doaj
Influence of sowing amount and substrate thickness on the quality of sandy ecological grass blankets [PDF]
[Objective] Under the condition of ensuring the quality of the grass blanket, the study aims to select the appropriate combination of substrate thickness and seeding rate, and achieve the coordination and unity of ecological and economic effects in ...
FENG Zhidao +4 more
core +1 more source
Shuitu Baochi Xuebao, 2022 为了阐明人工梭梭林土壤碳氮磷密度及其生态化学计量特征演变规律,以吉兰泰荒漠区不同林龄(3,6,11,16年)人工梭梭林为研究对象,分析0—20,20—40,40—60 cm土层土壤有机碳(SOC)、全氮(TN)、全磷(TP)密度和生态化学计量特征。结果表明:(1)4种林龄人工梭梭林0—60 cm土层SOC、TN含量及其密度随林龄增加而升高,而TP含量及其密度随林龄增加而降低。其中,3,6年梭梭林SOC、TN含量及其密度随土层深度增加而升高,TP含量及其密度则与之相反;11,16年梭梭林SOC、TN ...
魏亚娟 +6 more
doaj +2 more sources
野生动物学报, 1996 本文建立了扎龙国家自然保护区苍鹭营巢的最适生境选择指数模型。通过对影响苍鹭营巢的主要生境因子水源、植被种类、植被密度和植被高度等进行调查分析，分别建立了相应的选择指数，为苍鹭营巢的生境质量评价提供了一种建模思想。
孙洪志 +3 more
doaj
Shuitu Baochi Xuebao, 2001 在 8～ 15°的红壤坡地上 ,对水土流失作了 14年的定位观察。结果表明 :水土流失与土壤坡度和植被覆盖度密切相关。红壤坡地一经开发利用 ,径流量就成倍地减少 ;而侵蚀量在开始的头 2年成倍增加 ,第 3年后趋于稳定。土壤侵蚀量与坡度呈极显著的对数正相关 ,坡度每增加 1°,土壤侵蚀量递增约 12 0 t/ (km2·a) ;土壤侵蚀量与植被覆盖度呈显著的负指数相关 ,当植被覆盖度 >6 0 %时 ,土壤侵蚀量在 2 0 0 t/ (km2 · a)以下 ;土壤侵蚀量与耕种方式密切相关 ...
水建国 柴锡周 等
doaj +2 more sources
Haiyang yu huzhao为了解汉阳水网中的原生动物群落结构与物种多样性特征及其影响因子, 探讨原生动物对湖泊富营养化的响应规律, 于2021~2022年对水网中5个湖泊的水环境及原生动物进行了4个季节的调查分析。结果表明, 后官湖为轻度富营养, 三角湖和南太子湖为中度富营养, 墨水湖和龙阳湖为重度富营养。共检出原生动物31属59种, 其中后官湖种类最少, 有21种, 龙阳湖和墨水湖种类较多, 分别有41种、40种。原生动物年均密度的变化范围为123.37~579.47 ind./L, Shannon ...
熊 雪平 +4 more
doaj +1 more source
Analysis of Volatile Components and Critical Nutritional Components of Sea Buckthorn Leaves and Alcohol-extracted Freeze-dried Powder [PDF]
To explore the differences in volatile substances and critical nutrients between sea buckthorn leaves and freeze-dried powder obtained by vacuum freeze-drying.
Guoliang XING +5 more
core +1 more source
Carbon Reserve and Carbon Sink Potential Estimation of Mangrove in Guangdong Province [PDF]
[Introduction] The mangrove ecosystem has a high carbon sequestration capacity and is an important part of the global carbon cycle. Exploring its carbon sink potential can promote the mitigation and adaptation to climate change, providing a potential ...
Fang WEN +4 more
core +1 more source
Research Progress on Factors Controlling the Formation of Stone Cells in Pear Fruits and Their Effects on Fruit Texture [PDF]
As one of the important indicators for evaluating the quality of pears, stone cells exhibit a supportive effect on pear fruits and improve its storability.
WANG Ya, CAO Xuehui, NIAN Rui, YOU Kaiyan, ZHU Danshi
core +1 more source