干旱胁迫对3种冷季型草坪草光谱反射率及生理特征的影响     

赵志军  单贵莲  段新慧  姜华  任健  陈功  初晓辉 《草原与草坪》2016,(6):23-29

为探讨高光谱分析技术在草坪草水分监测上的应用,以草地早熟禾、高羊茅、多年生黑麦草为试验材料,测定了干旱胁迫下3种冷季型草坪草生理指标及光谱反射率。结果表明:随着干旱胁迫程度的加深,供试草坪草叶片相对含水量和叶绿素含量显著下降(P0.05),丙二醛含量、脯氨酸含量及敏感波段的(550和760 nm)的光谱反射率显著上升(P0.05),3种草坪草抗旱性能的强弱顺序为:高羊茅多年生黑麦草草地早熟禾。3种草坪草敏感波段光谱反射率(R_(550 nm),R_(760 nm))及高光谱参数(Rg,R0,GNDVI)与生理指标间呈显著或极显著相关,以R_(550 nm)与生理指标间的相关系数绝对值最大。同时R_(550 nm)构建了供试草坪草生理指标的估测模型,经检验,模型估测值与实测值相关性达显著或极显著水平。  相似文献   

生物多样性与地形及土壤因素对坡面产流产沙的耦合影响     

文博瑾  段高辉  温仲明 《草地学报》2023,31(4):1186-1197

生物多样性关系到生态系统的功能,而坡度和土壤因素是影响坡面产流产沙的重要因子。本研究基于黄土丘陵区生物多样性,并引入坡度、降雨前土壤含水量和土壤容重,探究其与坡面产流产沙总量的耦合关系。通过野外人工降雨试验,记录草本、灌木和乔木群落下的产流时间和产流产沙总量,并开展土壤植被调查。结果表明,与草本和乔木群落相比,灌木群落在延长产流开始时间和降低产沙总量上表现更优;植被群落功能离散度指数(FDiv)对产沙总量影响最大,Simpson指数(D)对产流总量影响最大,坡度仍然是不可忽视的第二重要影响因素;产流总量与坡度、土壤容重、D和功能丰富度指数(FRic)的回归关系优于产流总量分别与其的回归关系;产沙总量与坡度和FDiv指数的回归关系优于产沙总量分别与其的回归关系。植被保护与坡度改善将是该区水土保持规划工作的重点。  相似文献   

半干旱草甸草地不同处理下植被特征与土壤酶活性的变化     

王志婷  刘廷玺  童新  段利民  李东方  刘小勇 《草业学报》2023,32(3):41-55

不同草地处理措施对植被和土壤会产生重要的影响。为探究不同草地处理措施对草甸草地的影响,以科尔沁草甸草地不同点为研究对象,设置围封（UNM）、围封+刈割（M）、围封+火烧（F）、放牧（G）4种处理,针对生长季土壤脲酶（S-UE）、碱性磷酸酶（S-AKP）、蔗糖酶（S-SC）活性和植被特征等开展研究,以探究草甸草地的最佳处理方式。结果显示：1）土壤酶活性随着土层深度的增加而降低,不同处理间的差异随着土层深度增加逐渐降低。2）放牧较围封处理,不同点植被高度、盖度、地上生物量和酶活性均降低,而丰富度指数增加。3）刈割较围封处理,不同功能群物种的补偿能力不同,禾本科的补偿能力大于菊科。4）火烧较围封处理,不同点植被高度、盖度、地上生物量、丰富度指数和3种水解酶活性均增加。5）多年刈割较放牧处理,植被高度、盖度和地上生物量和蔗糖酶、碱性磷酸酶活性均增加,丰富度指数和土壤脲酶活性均降低。综上所述,控制性火烧是半干旱地区草甸草地的最佳处理方式。  相似文献   

土质边坡稳定安全系数影响因素的     

邹沐  段亚辉 《中国农村水利水电》2006,(6):73-75

土质边坡稳定安全系数的计算值主要与采用的简化计算方法和土工参数有关。采用正交试验法计算分析了不同的计算方法、材料参数、水位及其相关荷载、地震作用等对边坡安全系数计算值的影响，进而对设计中的计算方法和材料参数提出了一些有益的建议，并提出了在工程运行管理中应尽量避免低水位或水位骤降情况的意见，为土石坝类工程的设计与运行管理提供了重要参考。  相似文献   

Biodegradation of Linear Alkyl Benzene Sulphonate     

XIANG Li-jun  WANG Bo-chu  DUAN Chuan-ren  LIU Liu  WANG Qing-hongnistry of Education  College of Bioengineering  Chongqing University  Chongqing  Chin 《保鲜与加工》2004,(10):71-74

The paper researches on the degradation of LAS (Linear Alkyl benzene Sulphonate) by combining AS1.860 immobilized with low intensity ultrasonic irradiation. The paper also discusses the influence of pH, rotary velocity, LAS concentration and the condition of low intensity ultrasonic irradiation on the degradation of LAS, the degradation rate of LAS is the main index of our experiment, the results of orthogonal test shows that low ultrasonic irradiation can increase the metabolizing of microorganism cells and facilitate the biodegradation of immobilized cells to LAS, here we research the degradation condition of 50mg/L LAS simulation wastewater with low ultrasonic irradiation, and the results show that the influence is obvious, the optimization degradation rate is about 83%, nine point five percent higher than that of the immobilized cells without ultrasonic irradiation.  相似文献   

New Progression about Gravity Quantization in General Relativity Theory in Real Space-time     

DUAN Shao guang 《保鲜与加工》2002,(1):109-112

Professor Venzo de Sabbata,working at World Laboratory,Lausanne,Switzerland,and Department of Physics,University of Bologna and Ferrara,Italy,is a famous Italy Physicist in the world.He is engaged with a series of creating research works about gravity quantization of General Relativity Theory in the real space-time which attract the attentions of the world.This paper pays the attention to introduce the works of this field,containing mainly:1.quantizing the general relativity theory in the sense of Einstem-Cartan theory,i.e., general relativity adds the torsion,which means introducing spin into the theory of gravity.2. building a compact mathematical tool for research of gravity quantization,the geometric algebra in the real space-time--multivector algebra,i.e.,developing a spinor manifold in the real space-time.  相似文献   

Mechanical Signalling in Plant: Perception and Transduction Pathway     

ZHOU Jing  WANG Bo-chu  DUAN Chuan-ren  ZHU Li-qing 《保鲜与加工》2006,(3):112-115

The metabolism and development of plants are controlled through interplay between genetic and environmental cues.For optimal growth plants require the ability to coordinate complex developmental processes and at the same time sense and respond to environmental stimuli.The responses can be divided into three main events: stimulus perception,generation and transmission of a signal,and subsequent changes in downstream biochemical processes.Because of space limitation this review does not provide an exhaustive account of plant signal transduction.Rather,the authors intention is to cover new and important results in this field,including the mechanochemical transform mediated by integrin and integrin-like protein,the change of membrane fluidity respond to stimulus,and the wide accepted transduction pathway of calcium signaling system.The research emphasis and tendency are prospected.  相似文献   

Study on Optimum Design of Rectangular Sedimentation Tanks     

CAI Jin-bang~  ZHU Liang~  DUAN Xiang-bao~ 《保鲜与加工》2005,(6):67-70

In this paper,the flow velocity fields,suspended solids concentration fields and flow-through curves in rectangular sedimentation tanks with different reaction baffles location,inlet horizontal velocity and length height ratio are simulated in detail using a developed mathematical model given in Reference 2.According to the numerical results,the influence of different reaction baffles location,inlet horizontal velocity and length height ratio on the operating efficiency is analyzed.Finally,the rational reaction baffles location,inlet horizontal velocity and length height ratio are presented.  相似文献   

Application of Multivector Algebra in Real Space-time to Set Pair Analysis     

DUAN Shao-guang 《保鲜与加工》2004,(11):66-70

The contact number is an important mathematical tool of systems theory and methods in the monograph Set Pair Analysis and Its Preliminary Applications written by Zhao Keqin for unitizedly processing the uncertainties due to the fuzzy, stochastic, intermediate and information uncomplete about something. The article applies the multivector algebra which is isomorphism with the real Dirac algebra in the real space-time adopted by Venzo de Sabbata to the contact number of set pair analysis, and consequently, the contact number is generalized correspondingly.  相似文献   

Tissue Culture and Rapid Propagation of Actinidia chinensis     

YANG Xiao cheng  WANG Bo chu  YE Zhi yi  DUAN Chuan ren  CHE Xiao yan 《保鲜与加工》2002,(6):75-77

It has been briefly studied and reported that Actinidia chinensis , one of economic woody plants, has been bred with the method of plant tissue culture. Aim at the shortage of traditional plant tissue culture ways which ignored the refinement and transplant of test-tube seedling, it strengthen the study to breeding and management of Actinidia chinensis seedlings before they grow up and become mature seedlings. Through our explore, the transplant survive rate of tissue-culture seedlings attain to about 85%.This study is the improvement to traditional breeding seedling means and it is helpful to the rapid propagation of those economic woody plants.  相似文献