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Soil Health Assessment of the Main Plant Communities in Rocky Mountain Area of North China

Author: QianDengFeng
Tutor: ShiDongMei;YangLiWen;ZhouJinXing
School: Southwestern University
Course: Soil and Water Conservation and Desertification Combating
Keywords: Soil health Plant communities Assessment Rocky mountain area of north china
CLC: S718.4
Type: Master's thesis
Year: 2007
Downloads: 127
Quote: 8
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Abstract


Soil health is the base of terrestrial ecosystems health. Keeping and improving soil health iscrucial for human surviving and sustainable development. This paper chose the main plantcommunities in rocky mountain area of north china as research object including artificial pinus、artificial platyeladus and shrublands Based on the analysis of plant diversity of the main plantcommunities,soil physical and chemical property and biological characteristic （soil respiration）, weevaluated the soil health preliminary. Using the method of main ingredient analysis to evaluate soilhealth of the main plant communities comprehensively, we selected the evaluation indicators of soilhealth in rocky mountain area of north china. The main conclusions are as follows:（1） The plant diversity index of artificial platyeladus H（2.482）, D（0.899）, J（1.635） wasclosed to the artificial pinus H （2.509）, D （0.892）, J （1.60）.Because of the special environmentcondition, the shrublands had lower plant diversity index （H1.770, D0.773, J1.07）.（2） The soil various particles of the main plant communities arranged from 0.02mm. to0.002mm. The variation regularity of subsoil property was invisible compared to the surface soil.The soil bulk density、field capacity and saturated water content in subsoil of shrublands was thehighest, and the value was 1.380 g/cm3、23.68%、40.99%,while the value of artificial platyeladuswas the lowest （1.450 g/cm3、18.56%、32.08%）. Seeing from soil physical property, the soil conditionof artificial platyeladus is best.（3） The organic matter content of artificial platyeladus, shrublands, artificial pinus was39.0g/kg、32.0g/kg、12.0g/kg respectively. The total P in surface soil were ranked in decreasing trendas shrublands （0.031g/kg）>artificial pinus （0.027g/kg）>artificial platyeladus （0.02g/kg）.Theavailable N、P were ranked in decreasing trend as artificial platyeladus （85.607mg/kg、3.682mg/kg）>shrublands （85.074mg/kg、1.695mg/kg）>artificial pinus （43.516mg/kg、1.409mg/kg）. The total Kwas ranked in decreasing trend as artificial pinus （21.733g/kg）>artificial platyeladus （21.233g/kg）>shrublands （19.614g/kg）. The available K Was ranked in decreasing trend as shrublands（109.50mg/kg）>artificial pinus （97.03mg/kg）>artificial platyeladus （95.0mg/kg）. The cationicexchange content was ranked in decreasing trend as artificial platyeladus （19.380 me/100g）>shrublands （9.740 me/100g）>artificial pinus （3.250 me/100g）.Through the index analysis of soilnutrient, the soil health condition of artificial platyeladus is much better than artificial pinus andshrublands.（4） The soil respireation rate of main plant communities in rocky mountain area of north chinahad visible diurnal and seasonal dynamic change.The soil respireation varied along with soiltemperature（0～10cm）.The peak value of soil respireation rate appeared at 15:00 and the minimumvalue appeared at 2:00～5:00. The seasonal dynamic change is closed to temperature andprecipitations. The soil respireation rate of seasonal change was ranked in decreasing trend assummer(3.146 umolm-2s-1)>autumn (2.417 umolm-2s-1)>spring (1.813 umolm-2s-1)>winter(0.258umolm-2s-1).The soil respireation rate of different plant communities exhibit artificial platyeladus(2.642 umolm-2s（-1）)>shrublands(1.701 umolm-2s-1)>artificial pinus(1.177umolm-2s-1).（5） In order to evaluate soil health in rocky mountain area of north china comprehensively, weselected ten main evaluation indicators, including （soil total porosity, Organic matter content, totalN、P, available N、K,PH, soil respireation rate, richness, evenness index）.The comprehensive scorewas ranked in decreasing trend as artificial platyeladus （2.365）>pinus shrublands（-0.917）>artificial pinus （-1.448）.

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