JOURNAL OF NATURAL RESOURCES >
Effects of Different Land Use Patterns on Soil Nutrients and Soil Active Organic Carbon Components in Karst Mountain Area
Received date: 2011-12-04
Revised date: 2012-04-24
Online published: 2012-12-20
Soil nutrients and six active components (microbial biomass C, N, P, basal respiration, easily oxidized organic carbon and dissolved organic carbon) under five typical land use patterns (forest, Chinese prickly ash orchard, pitaya orchard, grassland returning from farmland and dry land ) were measured to discuss soil quality in response to different land use patterns, providing scientific basis for selecting rational land use patterns and rocky desertification control in karst mountain areas. The results showed that the contents of soil nutrient and active component were the highest in forest, where soil organic carbon, microbial biomass C, N, P, easily oxidized organic carbon and dissolved organic carbon contents were 44.80 g·kg-1, 477.86 mg·kg-1, 102.87 mg·kg-1, 17.54 mg·kg-1, 7.72 g·kg-1 and 166.43 mg·kg-1, respectively, soil nutrient and active component contents were decreased in the order of Chinese prickly ash orchard, pitaya orchard, grassland returning from farmland and dry land. Except soil nutrient and active component contents in dry land were closer to grassland returning from farmland which had naturally recovered 15 a, mostly below the significant difference level, however, significantly differences in soil nutrient and active component were detected in other land uses. The RAD showed that soil organic carbon is a main impact factor to the active component. The cumulative effect to soil nutrients and active component in Chinese prickly ash orchard was only next to forest, but obviously higher than that in pitaya orchard and dry land. This study clarified that natural repair is a slow process which needs necessary afforestation measures in karst soil, and Chinese prickly ash orchard can be used as a priority vegetation in agricultural production or ecological restoration in karst mountain areas.
LIAO Hong-kai, LONG Jian, LI Juan . Effects of Different Land Use Patterns on Soil Nutrients and Soil Active Organic Carbon Components in Karst Mountain Area[J]. JOURNAL OF NATURAL RESOURCES, 2012 , 27(12) : 2081 -2090 . DOI: 10.11849/zrzyxb.2012.12.009
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