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河南典型草地碳氮库构成对植物多样性的响应

赵威*,李琳,王艳杰   

  1. (河南科技大学农学院, 河南洛阳 471023)
  • 出版日期:2019-04-10 发布日期:2019-04-10

The responses of carbon and nitrogen pool composition to plant diversity in typical grasslands of Henan Province.

ZHAO Wei*, LI Lin, WANG Yan-jie   

  1. (College of Agriculture, Henan University of Science and Technology, Luoyang 471023, Henan, China).
  • Online:2019-04-10 Published:2019-04-10

摘要: 以河南4种典型草地类型(暖性草丛、暖性灌草丛、热性草丛与热性灌草丛)为研究对象,基于野外调查与室内测定,结合RDA冗余分析方法,分析了植物多样性与生态系统碳氮库构成之间的关系。结果表明:河南草地植物物种多样性整体上呈现出灌草丛类草地大于草丛类草地;河南草地具有符合地域特征的植物功能群类型,C3植物比例均远大于C4植物,杂类草占64%~73%,有性兼无性繁殖方式的植物类型多达49%~56%;而生活型组成较为复杂,暖性草地以多年生草本和灌木为主,热性草地以一或两年生草本以及多年生草本为主;RDA分析结果显示,暖性草丛、暖性灌草丛植被氮密度与Shannon和Pielou指数呈正相关,植被碳密度、土壤氮密度与Shannon和Pielou指数呈负相关;热性草丛植被碳氮密度与物种丰富度指数呈正相关,土壤氮密度与Shannon和Pielou指数呈正相关,植被氮密度与Shannon和Pielou指数呈负相关;热性灌草丛土壤碳氮密度与Shannon指数呈正相关,植被碳氮密度与物种丰富度和Shannon指数呈负相关,即物种多样性及不同草地类型植被的组成共同作用影响植被和土壤碳氮密度。总之,河南草地生态系统碳氮库构成是植物物种丰富程度和分布均匀程度综合作用的结果。

关键词: Bt玉米, Bt蛋白, 土壤养分

Abstract: With field investigation and laboratory analysis, the relationships of plant diversity with carbon and nitrogen pool composition in four typical grassland ecosystems including warmtemperate tussock (WT), warmtemperate shrub tussock (WS), tropical tussock (TT) and tropical shrub tussock (TS) in Henan Province were explored through redundancy analysis (RDA). The results showed that plant species diversity in the shrub tussocks was higher than that of the tussocks. The plant functional groups in Henan grasslands were conformed to the regional characteristics. The proportion of C3 plants was much higher than that of C4 plants, while the weeds accounted for 64%-73%. The proportion of plant species with sexual and asexual reproduction patterns was up to 49%-56%. The composition of life forms was complex. Warm grassland was dominated by perennial herbs and shrubs, and tropical grassland was dominated by annual orbiennial herbs and perennial herbs. The results of RDA analysis showed that nitrogen density in the vegetation of WT and WS was positively correlated with Shannon and Pielou indices. Community carbon density was negatively correlated with soil nitrogen density and Shannon and Pielou indices. There was a positive correlation between carbon and nitrogen density and species richness of TT, a positive correlation between soil nitrogen density and Shannon and Pielou indices, and a negative correlation between vegetation nitrogen density and Shannon and Pielou indices. Soil carbon and nitrogen density of TS was positively correlated with Shannon index, and community carbon and nitrogen density was negatively correlated with species richness and Shannon index. That is, species diversity and vegetation composition of different grassland types co-affected carbon and nitrogen density of vegetation and soil. The composition of carbon and nitrogen pools in Henan grassland ecosystems was the result of a combination of plant species abundance and distribution uniformity.

Key words: Bt corn, Bt protein, soil nutrient.