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The Study of Soil Chemical Properties and Plant Diversity in Different Forest Types of Xinjiashan Qinling Mountains

Author: LiuRuiYing
Tutor: YangGaiHe
School: Northwest University of Science and Technology
Course: Plant resources
Keywords: Qinling Sim Jiashan Soil nutrients Soil pH Species diversity
CLC: S718.5
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract

The forest is a very important part of the global ecosystem, capable of regulating the climate, conserving water, clean air, sand-fixing and other development critical to the maintenance of the ecological balance of the earth and the survival of humanity. The Qinling - Yellow River and Changjiang River watershed, the dividing line between north and south China climate. The vertical zonal vegetation zones and soil types bred the Qinling rich, unique vegetation type. Sim Jiashan, located in the western southern slope of the Qinling Mountains, Jialing River, North Qinling main ridge topography undulating, with both complex and regular features. Beneficial plant species diversity on the formation of research, of forest structure type characteristics as well as changes in soil nutrient status regular. This study was conducted from June 2008 to August 2010, nine different forest types in Qinling Sim Jiashan forest areas (birch forest, Ash forest Sharptooth oak forest, Chinese pine - Manchurian ash forest, spruce - Sharptooth oak mixed forest, Pinus tabulaeformis - daughter elm mixed forest, pine forest, Armand pine and spruce forest) soil and ground vegetation community survey, based on quantitative analysis of the Sim Jiashan soil chemical properties of the forest area and its and the relationship between the different forest types, different depth variation, the species diversity. The results show that: (1) Sim Jiashan forest areas of different forest types, soil nutrients, pH, there are significant differences. Are showing the surface soil (0 ~ 20cm) content is higher than in the lower organic matter content and decreasing trend with soil depth, organic matter content. Nine kinds of forest types, the sharptooth oak and spruce forest soil organic matter content; spruce forest soil total nitrogen content (2.97g/kg), nitrogen content (257.61mg/kg) are nine kinds of forest is the Huashan pine trees 5.64 times is highest; Chinese pine forest soil phosphorus content of the highest, highest Manchurian ash soil available phosphorus content; the Huashan pine forest soils indicators are the lowest. (2) 9 different forest soil types and three soil (0 ~ 20cm, 20 ~ 40cm, 40 ~ 60cm) vertical variation differences. Among them, Chinese pine - the Manchurian ash mixed forest topsoil organic matter content is 1.39 times higher than the underlying difference between the maximum and the minimum difference between the birch forest organic matter content of the soil surface, 14% higher than the lower; Sharptooth oak forest soil surface total nitrogen content than 44% of the under-storey; PINE - daughter elm mixed forest soil available phosphorus content decreasing sharpest reached 24%. (3) the area nine kinds of forest type soil pH ranged from 4.75 to 6.22 between soil pH was surface lower than the lower multi. (4) analysis: soil total nitrogen and organic matter, alkaline hydrolysis nitrogen, total phosphorus content reached a very significant positive correlation; alkaline hydrolysis nitrogen and organic matter, total phosphorus, a significant positive correlation; pH and total nitrogen was significantly negatively correlated; soil available phosphorus content correlation with soil phosphorus content was not significant. (5) Pielou index sort: spruce the sharptooth oak forests gt; the Pinus tabulaeformis Manchurian ash Lin gt; the sharptooth oak forests gt; birch forest gt; the oil pine gt; the spruce forest gt; the Pinus tabulaeformis daughter elm gt; water Song Liulin gt; the Huashan pine forests; Simpson index (D) of the order of: spruce the sharptooth oak forests gt; the Pinus tabulaeformis Manchurian ash Lin gt; the sharptooth oak forests gt; birch forest gt; the oil pine gt; P. tabulaeformis - daughter elm mixed forest gt; the spruce forests gt; the Manchurian ash Lin gt; the Huashan pine forests; Shannon-Wiener Index (H) in the order: spruce the sharptooth oak forests gt; the birch forest gt; spruce forests gt; sharp teeth oak forest gt; the Pinus tabulaeformis Manchurian ash Lin gt; the Manchurian ash Lin gt; the P. tabulaeformis daughter elm gt; the oil pine gt; Huashan pine. (6) The Institute selected six soil factors, in addition to pH and plant diversity no relevance outside, the rest have a significant correlation.

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