摘要
【目的】研究不同等级石漠化生态系统植物群落结构组成、植物多样性和土壤理化性质特征及其两者间的相关性,为我国西南喀斯特高原峡谷森林生态保护和植被恢复重建提供科学依据。【方法】运用空间代替时间方法,研究石漠化演替过程中植物群落特征与土壤理化性质的响应;对喀斯特高原峡谷脆弱生态系统植物群落与土壤理化性质的内在关系进行了冗余分析。【结果】研究区植被物种组成简单,绝大多数为1科1属1种生活型;随着石漠化强度的增加,群落高度、平均地径、平均冠幅和地上生物量趋于减少。不同等级石漠化环境植物多样性4种指数均很低,且与石漠化等级无明显的耦合关系;除丰富度指数外,不同等级石漠化的优势度指数、多样性指数和均匀度指数具有显著差异。大多数土壤理化因子在不同等级石漠化环境中具有显著的差异,并显示随着石漠化程度的增加表现为先退化后改善的趋势。冗余分析表明,土壤呼吸、速效钾、土壤干湿程度、有效磷和酸碱度是影响植物群落特征的主要土壤因子,对群落特征的解释量为68.5%。【结论】土壤呼吸、土壤养分、含水量和土壤孔隙状况是促进喀斯特高原峡谷石漠化生态系统植被恢复的主要土壤因素,而过大的土壤容重以及土壤的偏碱性则不利于当地植被的恢复。
【Objective】The aim of the study was to investigate the plant community structure, plant dive-rsity, soil physic-chemical properties and their correlations among rocky desertification ecosystems underdifferent degrees in karst plateau canyon region of Guizhou Province. This study could provide a scienti-fic reference for forest ecological conservation and vegetation restoration of karst plateau canyon region inSouthwest China.【Method】The ＂space instead of time＂ method was used to study the response of plantcommunity characteristics and soil physic-chemical properties during the process of rocky desertificat-ion. And redundancy analysis （RDA） was used to reveal the relationships between plant communitycharacteristics and soil physic-chemical properties.【Result】The vegetation composition of the studiedarea was relatively simple and the majority of the species belong to one genus of one family. The comm-unity height, average ground diameter, average crown and aboveground biomass decreased with increasingdegree of rocky desertification. The four plant diversity indices was low in all communities and had noobvious relationship with rocky desertification grades. Eccept for richness index, the indices of dominance,diversity and evenness were significantly different among different degrees of rocky desertification. Mostsoil physic-chemical variables showed significant differences among rocky desertfication degrees and theydecreased firstly and then increased with increasing degree of rocky desertification. The redundancyanalysis showed that soil respiration, available potassium, soil dry and wet degree, available phosphorusand pH were the main soil factors affecting plant community characteristics and they together explained68.5% varitions of community characteristics.【Conclusion】Soil respiration, soil nutrient, moisture andsoil porosity are key factors that promote the vegetation restoration of karst plateau rocky desertificationecosystem. However, greater soil bulk density and alkaline soil are n
作者
温培才
王霖娇
盛茂银
WEN Pei-cai;WANG Lin-jiao;SHENG Mao-yin(Karst Research Institute,Guizhou Normal University,Guiyang 550001,China;National Engineering Research Center for Karst Rocky Desertification Control,Guiyang 550001,China)
出处
《四川农业大学学报》
CSCD
北大核心
2018年第2期175-184,共10页
Journal of Sichuan Agricultural University
基金
国家自然科学基金项目(31660136)
贵州省科技计划课题(黔科合社G字[2012]4008)
关键词
喀斯特
石漠化
植被
土壤
演替
karst
rocky desertification
vegetation
soil
succession
