Effects of Plantation on Soil Nutrient and Evaluation in Yuanmou Dry-hot Valley

MA Jiang-ming; LI Kun

This paper selected surface soil organic matter,total nitrogen,available nitrogen,phosphorus and potassium contents to study the effects of plantation on soil nutrient in Yuanmou Dry-hot Valley,then evaluated with grey relational analysis.Results are as below:(1) Surface soil organic matter and total nitrogen contents of 12-year old of Eucalyptus,Acacia glauca,Leucaena leucacephala increased much more than that of other 10-year old and 6-year old plantations.Surface soil organic matter contents of each plantation was higher than that of the control plot.Mixed forests could increase surface soil organic matter contents much more than that of pure forests.Surface soil organic matter contents of all plantations was under 0.1%.(2) The variation of available nitrogen was accordant with total nitrogen content.Available phosphorus content fluctuated much,available potassium content was abundant,pH value ranged from 4.44～6.42.(3) Through grey relational analysis,the E.camaldulensis + A.glauca mixed forest had the most effect on the soil nutrient most with the association coefficient of 0.651.The A.torulosa pure forest got the least with the association coefficient of 0.343.

1. Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, Yunnan, China

2. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China

3. Yuanmou Desert Ecosystem Research Station, State Forestry Administration, Kunming 650224, Yunnan, China

Received Date: 2005-11-10

Abstract: This paper selected surface soil organic matter,total nitrogen,available nitrogen,phosphorus and potassium contents to study the effects of plantation on soil nutrient in Yuanmou Dry-hot Valley,then evaluated with grey relational analysis.Results are as below:(1) Surface soil organic matter and total nitrogen contents of 12-year old of Eucalyptus,Acacia glauca,Leucaena leucacephala increased much more than that of other 10-year old and 6-year old plantations.Surface soil organic matter contents of each plantation was higher than that of the control plot.Mixed forests could increase surface soil organic matter contents much more than that of pure forests.Surface soil organic matter contents of all plantations was under 0.1%.(2) The variation of available nitrogen was accordant with total nitrogen content.Available phosphorus content fluctuated much,available potassium content was abundant,pH value ranged from 4.44～6.42.(3) Through grey relational analysis,the E.camaldulensis + A.glauca mixed forest had the most effect on the soil nutrient most with the association coefficient of 0.651.The A.torulosa pure forest got the least with the association coefficient of 0.343.

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Reference (19)

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Effects of Plantation on Soil Nutrient and Evaluation in Yuanmou Dry-hot Valley

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