青土湖不同年限退耕地植被演替及土壤酶活性研究
投稿时间:2021-07-01  修订日期:2021-09-14  点此下载全文
引用本文:
摘要点击次数: 68
全文下载次数: 0
作者单位邮编
王佳 甘肃农业大学林学院 730070
田青 甘肃农业大学林学院 730070
王理德 甘肃省治沙研究所 730070
何洪盛 甘肃农业大学林学院 730070
宋达成 甘肃省治沙研究所 730070
郭春秀 甘肃省治沙研究所 730070
基金项目:国家自然科学基金(31760709);甘肃省重点研发计划(21YF8FA038); 甘肃省青年科技基金(18JR3RA019)
中文摘要:采用时空替代法,对青土湖区不同年限退耕地(退耕1 a、2 a、4 a、8 a、13 a、20 a、30 a、40 a和CK)植被演替特征、土壤酶活性及相关性进行调查与分析。结果表明:(1)青土湖区在退耕40 a自然恢复过程中,随退耕年限增加,个体数、类群数和Margalef丰富度指数呈波动式下降的趋势;Shannon多样性指数和Pielou均匀度指数总体趋势先增加后减小,再逐渐趋于稳定;Simpson优势度指数整体变化幅度较小,最终呈稳定的趋势。(2)在不同土层(0~20 cm和20~40 cm)4种土壤酶活性随退耕年限不断增加总体表现出先升高后下降再逐渐趋于稳定的趋势。均在退耕8 a后显著下降,磷酸酶活性和脲酶活性要显著低于蔗糖酶活性和过氧化氢酶活性。不同年限的退耕样地与对照样地(CK)相比,磷酸酶活性与脲酶活性随退耕年限增加而下降。从土层垂直分布来看,土壤磷酸酶、蔗糖酶和脲酶活性均随土层加深而降低。(3)在0~20 cm土层中,类群数与土壤蔗糖酶活性、磷酸酶活性以及脲酶活性的关系显著相关,呈正相关关系;在20~40 cm土层中,类群数和土壤脲酶活性的相关性极其显著,且呈正相关关系,而与土壤过氧化氢酶活性呈显著负相关;Margalef丰富度指数与0~20 cm土层的磷酸酶活性和蔗糖酶活性呈显著正相关,与脲酶活性呈极显著正相关;在20~40 cm土层中,Margalef丰富度指数与脲酶活性呈极显著正相关;Shannon多样性指数、Pielou均匀度指数和Simpson优势度与4种土壤酶活性间均无显著的相关关系。通过对不同年限退耕地植被群落特征和土壤酶活性分析,探讨植被群落和土壤酶活性二者间的相关性,旨在为该区生态系统的修复及生态环境建设提供科学理论基础。
中文关键词:青土湖  退耕地  植被自然演替  土壤酶活性  
 
Study on vegetation succession and soil enzyme activity of Abandoned Farmland in Different Years in Qingtu Lake
Abstract:using space-time substitution method, The vegetation succession characteristics, changes in soil enzyme activities and their correlations were investigated and analyzed for different years of abandoned farmland (returned fields 1 a, 2 a, 4 a, 8 a, 13 a, 20 a, 30 a, 40 a and CK) in Minqin Qingtu Lake area. The results showed that: (1) Qingtuhu area was in the process of natural restoration after 40 years of farmland conversion, In the natural recovery process of 40 years of farmland conversion in Qingtuhu area, with the increase of the period of returning farmland,the number of individuals gradually decreased, while the number of taxa and Margalef richness index showed a fluctuating decreasing trend. Shannon diversity index and Pielou evenness index increased first and then decreased, and then gradually stabilized. The overall change in Simpson dominance index was small and eventually showed a stable trend. (2) The activities of the four kinds of soil enzymes in different soil layers (0-20 cm and 20-40 cm) increased firstly, then decreased and then gradually stabilized with the increase of returning years. All decreased significantly after 8 a of farmland withdrawal,Phosphatase activity and urease activity were significantly lower than sucrase activity and peroxidase activity. Phosphatase activity and urease activity decreased with the increase of returning years in comparison with control cropland (CK) at different years of returning farmland. In terms of vertical distribution of soil layers, Soil phosphatase, sucrase and urease activities all decreased with deepening of the soil layer. (3) In the 0-20cm soil layer, The number of taxa was significantly and positively correlated with soil sucrase activity, phosphatase activity and urease activity; In the 20-40 cm soil layer,The correlation between the number of taxa and soil urease activity was extremely significant and positive, while it was significantly negatively correlated with soil peroxidase activity;Margalef richness index was significantly and positively correlated with phosphatase activity and sucrase activity in the 0-20 cm soil layer and was highly significantly and positively correlated with urease activity. In the 20-40cm soil layer, Margalef richness index was extremely significantly positively correlated with urease activity; Shannon diversity index, Pielou evenness index and Simpson dominance index had no significant correlation with soil enzyme activities. By analyzing the vegetation community characteristics and soil enzyme activities of the abandoned farmland in different years, To explore the correlation between vegetation communities and soil enzyme activities, The aim is to provide scientific and theoretical basis for the restoration of the ecosystem and the construction of the ecological environment in the region.
keywords:Qingtu-Lake  abandonedland  natural succession of vegetation  soil enzyme activity.
  查看/发表评论  下载PDF阅读器
   今日访问:3341    总访问量:15900509

版权所有:《西北植物学报》编辑部

技术支持:北京勤云科技有限公司