Soil samples were collected from primary forest,natural secondary forest,Pinus caribaea and Acacia mangium stands in Baisha County,Hainan Province,for the determination of soil chemical properties including soil pH,or...Soil samples were collected from primary forest,natural secondary forest,Pinus caribaea and Acacia mangium stands in Baisha County,Hainan Province,for the determination of soil chemical properties including soil pH,organic matter,total and available N,P and K.The effects of soil layers and forest stands on soil chemical properties were compared.Results showed that forest soils in the studied area were strong acidic,with slight or moderate deficiency of available P,and moderate deficiency of available K(except the primary forest).The highest contents of soil total and available nutrients except for available P and total K were found in the primary forest,followed by natural secondary forest and Acacia mangium stands,and the lowest in Pinus caribaea stands.In soil layer A,except for total N and available P,significant differences were found for organic matter content and very significant differences for soil pH,hydrolyzable N,total P,and total and available K among the four types of forest stand.Similar trend was true for soil layer B.Correlation analysis indicated that soil organic matter content affected the total and available N,P and K in different manner.Soil organic matter had very significant or significant correlation with total N,and significant correlation with hydrolyzable N(only in soil layer B) in primary and natural secondary forests.Significant correlations beween organic matter and total N and P were found in Pinus caribaea stands,but no significant correlations between organic matter and soil nutrients existed in Acacia mangium stands.Some suggestions on forest management were also proposed to improve forest soil quality.展开更多
In order to understand the dynamic change of soil chemical characteristics along with the succession stages for supporting forest restoration,the soil chemical characteristics in different succession stages were compa...In order to understand the dynamic change of soil chemical characteristics along with the succession stages for supporting forest restoration,the soil chemical characteristics in different succession stages were compared and analyzed.The results indicated that with the progress of succession,pH value,available P,and total K showed a decreasing trend while organic matters,total P,total N,alkaline hydrolytic N,and available K showed a trend of increase.The correlation analysis indicated that there was an significant correlation between soil chemical characteristics such as total N,alkaline hydrolytic N,available P and organic matters of different horizon in different succession stages.The correlation analysis somehow signified the main source of soil N and P was organic matters.During the forest restoration process,forest litters should be protected so as to increase soil organic matter and improve soil fertilization.展开更多
文摘Soil samples were collected from primary forest,natural secondary forest,Pinus caribaea and Acacia mangium stands in Baisha County,Hainan Province,for the determination of soil chemical properties including soil pH,organic matter,total and available N,P and K.The effects of soil layers and forest stands on soil chemical properties were compared.Results showed that forest soils in the studied area were strong acidic,with slight or moderate deficiency of available P,and moderate deficiency of available K(except the primary forest).The highest contents of soil total and available nutrients except for available P and total K were found in the primary forest,followed by natural secondary forest and Acacia mangium stands,and the lowest in Pinus caribaea stands.In soil layer A,except for total N and available P,significant differences were found for organic matter content and very significant differences for soil pH,hydrolyzable N,total P,and total and available K among the four types of forest stand.Similar trend was true for soil layer B.Correlation analysis indicated that soil organic matter content affected the total and available N,P and K in different manner.Soil organic matter had very significant or significant correlation with total N,and significant correlation with hydrolyzable N(only in soil layer B) in primary and natural secondary forests.Significant correlations beween organic matter and total N and P were found in Pinus caribaea stands,but no significant correlations between organic matter and soil nutrients existed in Acacia mangium stands.Some suggestions on forest management were also proposed to improve forest soil quality.
文摘In order to understand the dynamic change of soil chemical characteristics along with the succession stages for supporting forest restoration,the soil chemical characteristics in different succession stages were compared and analyzed.The results indicated that with the progress of succession,pH value,available P,and total K showed a decreasing trend while organic matters,total P,total N,alkaline hydrolytic N,and available K showed a trend of increase.The correlation analysis indicated that there was an significant correlation between soil chemical characteristics such as total N,alkaline hydrolytic N,available P and organic matters of different horizon in different succession stages.The correlation analysis somehow signified the main source of soil N and P was organic matters.During the forest restoration process,forest litters should be protected so as to increase soil organic matter and improve soil fertilization.
