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An analysis of soil nutrient elements in different terrains of coniferous(Tsuga chinensis var. tchekiangensis) and broadleaf mixed forest in Jiangxi Wuyishan
ZHAO Jiahao, YUAN Jingxi, YUAN Zaixiang, WANG Xiaomin, CHEN Bin, ZHENG Yuanqing, GUAN Qingwei
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (4) : 176-182.
PDF(1037 KB)
PDF(1037 KB)
An analysis of soil nutrient elements in different terrains of coniferous(Tsuga chinensis var. tchekiangensis) and broadleaf mixed forest in Jiangxi Wuyishan
Tsuga chinensis var. tchekiangensis is widely distributed in the Jiangxi Wuyishan National Naturae Reserve. The effects of topographical factors on the spatial variation of soil elements in a permanent plot of coniferous (T. chinensis var. tchekiangensis) and broadleaf mixed virgin forest in Jiangxi Wuyishan were investigated. This provided a model system to study the relationship between soil, vegetation and biodiversity conservation.
The study was carried out in a 6.4 hm2 coniferous and broadleaf mixed forest permanent plot, in the core region of the Jiangxi Wuyishan National Nature Reserve. The soil element content was analyzed from 160 samples, taken from 20 m × 20 m plots, which were divided into four topographic categories based on the clustering analysis of three topographic factors: altitude, convexity, and slope. The variation in the element contents of C, N, K, P, Fe, Na, Ca, Mg, Zn, Cu and Mn in the 0-20 cm layer of soil across the different terrains was analyzed to determine the relationship between the soil element content and the three topographic factors.
① The degree of variation in the soil element content in the permanent plot was moderate, although soil Cu and P varied the most, while K had the least variation; ② Only the element contents of soil C, N, P, Mg and Mn varied significantly among the different types of terrain; ③ Soil C increased with the increase of slope and decrease of altitude. Among the three topographical factors, soil Mn was most affected by convexity, followed by altitude, which was negatively correlated. Additionally, with the increase in convexity, the soil Ca content increased.
These results suggested that topography does affect the soil element content and migration distribution, in particular the content and distribution of plant essential nutrients N and P. This in turn may limit the distribution and regeneration of T. chinensis var. tchekiangensis population in the Jiangxi Wuyishan National Nature Reserve.
Tsuga chinensis var. tchekiangensis / virgin forest / coniferous and broadleaf mixed forest / terrain / soil nutrient element / Jiangxi Wuyishan National Natural Reserve.
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