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The Relationship between Biodiversity and Ecosystem Function in Danxia Herbaceous Communities on the Lithoid Cliff

Author: ZhaoYuQiang
Tutor: LiZhenJi
School: Xiamen University
Course: Botany
Keywords: Danxia Biodiversity - ecosystem function relationships Productive forces Sampling effect Complementary effects
CLC: Q948
Type: Master's thesis
Year: 2009
Downloads: 195
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Abstract

Danxia landform area of ??Wuyi Mountain in Fujian, Liancheng and Taining Danxia rock herbaceous community that grew plots of 16 randomly selected more than 300 4m to like parties field survey sampling study. Identification of plant species on the plot, to record apparent coverage of each species, life form, and for each life form in the part of the dominant species year biomass measured by indirect estimates for quadrats total aboveground biomass value, and as a the quadrats small community net primary productivity. Application of statistical software to calculate the rich analysis of primary productivity, productivity in quadrats stability and species richness, and considering the different factors that affect the results, including all species / obvious species (cover greater than 15% of the species) degrees, light plant stratification number or diversity of ecosystem functions, not the same side of the species and individual saturation, high-productivity species sampling effect detection and sample illumination space rate of change. The main results are as follows: (1) by quadrat survey statistics, survey plots within the test area (excluding plots) of vascular plants Division is a number of species: Wuyishan 63 families and 114 genera and 135 kinds Citylink 61 families, 118 genera 151 species of Taining 76 families, 151 genera and 197 species, the highest Taining. The Selaginellaceae, Gramineae, Gesneriaceae, nettle, Dryopteridaceae, Polypodiaceae Danxia rock herbaceous community of common subjects. Common dominant species of Selaginella, mountain Neyraudia, big flower on the stone lotus, southern selaginella, lily Danxia rock herbaceous community. (2) Taining test plots the number of species and productive relationship fitting curve is S-shaped curve, in line with the redundancy hypothesis; Citylink and Wuyishan pilot area for the scatter, in line with the uncertainty hypothesis. This difference may be different from different test vegetation and plant diversity status. All kind of parties by the the quadrats average number of species and the test area ratio of species richness Gleason scores (n_P / D) shows that the Wuyishan Community Species lowest saturation (n_P / D = 0.39), Citylink and Taining higher ( Citylink n_P / D = 0.49, Taining n_P / D = 0.43); Liancheng quadrat species on the individual saturation and without Taining. (3) all three test plots apparent relationship between species and their productivity linear increment mode, in line with the hypothesis of \The analysts believe that the rivet hypothesis about how to define species diversity play a role in the ecosystem. (4) The null hypothesis emphasized abiotic factors as a \Danxia Peak positive light of the rate of change than the valleys negative Danxia lower, and this corresponds to Taining Danxia top rock-positive rate of change in productivity than Qianlong Gap negative Danxia lower but Danxia Citylink Jiulonghu positive rather than control Xiantao Valley negative the Danxia like to productivity rate of change is higher. Moreover, the rate of change of light not only on the stability of the productivity effect, also have an impact on species richness. (5) the role of biodiversity in ecosystem functioning mechanism is briefly explore. Wuyishan, Taining test area within the quadrat, with light plants increase in the number of hierarchical productivity increase linearly; plots corresponding productivity with the large bunchgrass plant life form sampling rate increase, improved, but Taining sampling effect is less than Wuyishan. This result confirms the sampling effect is more significant role in the plot of the low biodiversity, high biodiversity plots, complementary effects more significant role. Through this analysis, on biodiversity - ecosystem function relationships of the four basic assumptions are correct, in a sense, but they are for different ecosystem models. On the basis of previous trials, the study proved once again that the role of biodiversity for ecosystem functioning, this effect will be the correction of non-biological factors.

The Relationship between Biodiversity and Ecosystem Function in Danxia Herbaceous Communities on the Lithoid Cliff

Abstract

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