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Effects of stand density on understory species diversity and soil erosion resistanc e of Cupressus funebris plantation in Yunding Mountain , Sichuan(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2022 04
Page:
1-10
Research Field:
Articles
Publishing date:

Info

Title:
Effects of stand density on understory species diversity and soil erosion resistanc e of Cupressus funebris plantation in Yunding Mountain , Sichuan
Author(s):
YU shunyao1 XIANG lin1 YU jing1 CHEN conglin1 SU tiancheng1 WANG yaoyao1 ZHANG hanwen 1 LI jing1 & HAO jianfeng 12**
1College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
2 The Key Laboratory of Soil and Water Conservation and Desertification Control, Sichuan Agricultural University, Chengdu 611130, China
Keywords:
stand density Cupressus funebris plantation species diversity soil erosion resistance
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2021.06023
DocumentCode:

Abstract:
To protect the ecosystem of barren mountains, massive Cupressus funebris plantations were planted in the hilly areas of central Sichuan Basin In the late 1980s. In recent years, Cupressus funebris plantations have faced with problems such as biodiversity decline and soil erosion. In order to study the effects of different forest density on understory species diversity and soil erosion resistance of Cupressus funebris plantation in Yunding Mountain, a typical sampling method was used to investigate the five different forest densit ies (1100, 950, 800, 650, 500 trees/hm2), to analyze the correlation between the species diversity index, soil erosion resistance and root index. Results: A total of 176 species were recorded in this area, belonging to 128 genera and 69 families. The number of species in the herb layer was more than that in the shrub layer. The species diversity index of shrub layer increased first and then decreased with the decrease of stand density, and the species richness index D and Shannon-Wiener diversity index H showed the peak values at the density of 650 trees /hm2; The species richness index D, Shannon-Wiener diversity index H, and Simpson dominance index H’ in the herb layer showed a bimod al trend of first increasing, then decreasing, increasing again and finally decreasing with the decrease of stand density, and the peak values were found at the densities 650 and 950 trees/hm2 When soil erosion resistance decreased with the stand density, itself showed a trend of increasing first and then decreasing single-peak type, reaching the peak at the density 650 trees/hm2. The positive correlation between species richness index and soil erosion resistance is obvious. The conclusion is that 650 trees/hm2 is relatively more conducive to the stability of species diversity and soil erosion resistance of cypress plantations.

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Last Update: 2021-09-08