宁夏干旱风沙区荒漠草原不同退化阶段植被土壤变化特征及其相关性OA北大核心CSTPCD
Changes in vegetation and soil characteristics and their correlations in grasslands at different stages of degradation on the desert steppe in an arid wind-sandy area of Ningxia
为深入了解荒漠草原不同退化阶段植被与土壤变化,探究荒漠草原不同退化阶段土壤性质与植被特征的关系,本研究以宁夏干旱风沙区荒漠草原为对象,比较了未退化、轻度退化、中度退化和重度退化4个退化阶段下草地植被和土壤性状,分析了草地退化过程中植被与土壤的关系.结果表明:随草地退化程度增加,草地优势种由多年生豆科、禾本科逐渐转变为一年生杂类草;不同草地植物功能群盖度、高度和地上生物量随着退化加剧变化并不相同(P<0.05);Shannon-Wiener多样性指数、Simpson优势度指数和Pielou均匀度指数呈下降趋势;土壤有机质、全碳、全氮、速效氮、速效磷和黏粒含量显著降低,但容重显著增加.冗余分析发现,荒漠草原植被特征与土壤因子密切相关,不同退化阶段影响草地植被特征的土壤性质不同.未退化阶段,草地的植被特征受全碳含量极显著影响,中度退化阶段,草地的植被特征受容重含量极显著影响,重度退化阶段,草地的植被特征受速效氮含量极显著影响(P<0.01).通过改善植被进而影响土壤或者补充土壤养分可能是一个有效的草地恢复策略.
The aim of this research was to gain a deeper understanding of the variations in vegetation and soil of desert grasslands at different stages of degradation,and to investigate the correlations between soil properties and vegetation characteristics within these stages.A field study was conducted in desert grasslands in the arid wind-sandy region in Ningxia,with an aim to compare the vegetation and soil characteristics across grasslands at four stages of degradation:Non-degraded,lightly degraded,moderately degraded,and heavily degraded.The relationship between vegetation and soil during the process of grassland degradation was analyzed.The results revealed that,as the degree of grassland degradation increased,there was a transition in the dominant species from perennial legumes and graminoids to annual miscellaneous grasses.The plant functional groups exhibited diverse responses in terms of vegetation coverage,height,and above-ground biomass (P<0.05).The Shannon-Wiener diversity index,Simpson's dominance index,and Pielou's evenness index showed consistent trends of decreasing as the degree of grassland degradation increased.Furthermore,with increasing severity of grassland degradation,there were significant decreases in soil organic matter content,total carbon and nitrogen levels,available nitrogen and phosphorus concentrations,and silt content,and a significant increase in bulk density.The results of a redundancy analysis revealed a strong correlation between the characteristics of desert grassland vegetation and soil factors in general.However,the specific soil properties influencing these vegetation characteristics varied among grasslands at different stages of degradation.In non-degraded grasslands,the total carbon content significantly affected vegetation characteristics,while bulk density played a significant role in moderately degraded grasslands.Heavily degraded grasslands were considerably impacted by the available nitrogen content (P<0.01).Improvements in vegetation or the supplementation of soil nutrients can be considered as effective strategies for restoring grasslands.
曹颖;聂明鹤;沈艳;胡艳;马登宝;李东;候腾思;方鹏;王学琴
宁夏大学林业与草业学院,宁夏银川 750021宁夏大学林业与草业学院,宁夏银川 750021||宁夏大学农业农村部饲草高效生产模式创新重点实验室,宁夏银川 750021||宁夏大学宁夏回族自治区草牧业工程技术研究中心,宁夏银川 750021||宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地,宁夏银川 750021宁夏吴忠市红寺堡区林业与草原局,宁夏吴忠 751999
退化阶段植被土壤冗余分析荒漠草原
degradation stagevegetationsoilredundancy analysisdesert steppe
《草业学报》 2024 (008)
1-14 / 14
宁夏重点研发计划项目(2020BBF02003,2021BEG02009),宁夏自然科学基金(2023AAC03043),宁夏大学-红寺堡校地共建项目(2022)和宁夏高等学校一流学科建设(草学)项目(NXYLXK2017A01)资助.
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