Nitrogen deposition was simulated from July 2014 to August 2015 in the grassland, woodland, and woodland-grassland border in Zhuqudeng Village, Bujiu Township, Linzhi County,(CK, 0 kg·hm^2·a^(-1); LN, 25 kg&...Nitrogen deposition was simulated from July 2014 to August 2015 in the grassland, woodland, and woodland-grassland border in Zhuqudeng Village, Bujiu Township, Linzhi County,(CK, 0 kg·hm^2·a^(-1); LN, 25 kg·hm^2·a^(-1), MN, 50 kg·hm^2·a^(-1); HN, 150 kg·hm^2·a^(-1)). NH_4NO_3 was used as nitrogen source to analyze the number of microorganisms in soil layers of 0–20 cm and 20–40 cm and explore the effect of different degrees of nitrogen deposition on soil microorganisms in grassland, woodland, and woodlandgrassland border. The results showed that: the number of bacteria in the grassland increased significantly under the treatment of LN, and the number of bacteria in the woodland-grassland border and woodland had a rising response under the influence of nitrogen deposition; the number of actinomycetes in the grassland increased in MN and HN treatment, and significantly increased in the border and woodland under LN treatment; the number of molds decreased sharply in the grassland, woodland, and woodland-grassland border.展开更多
Upland red soil has strong acidity and low fertility, different woodland types produce varying impacts on soil properties and nematode communities. To explore the response of soil, 2 different types of woodland were s...Upland red soil has strong acidity and low fertility, different woodland types produce varying impacts on soil properties and nematode communities. To explore the response of soil, 2 different types of woodland were selected to investigate the changes of soil properties and nematode communities compared to wasteland. The results showed that the content of soil organic carbon and total nitrogen in chestnut forest soil were the highest, 16.41 g/kg and 0.46 g/kg respectively; while the highest contents of soil microbial biomass carbon, nitrogen and phosphorus appeared in wasteland soil, and basal respiration of wasteland soil was 28.36 mg CO_2/kg·d, significantly higher than that of the other 2 soils(p <0.05). The nematode abundance also reached the peak in wasteland soil. Three types of soil exhibited a completely different nematode community structure: the dominant trophic group in wasteland soil was herbivores,while omnivores/predators and bacterivores in forest from farmland and chestnut forest soil, respectively.The influence of different types of woodland on ecological indices of nematode communities was not consistent. Degradation trends of soil properties and nematode communities were presented in the 2woodland types compared with wasteland soil. These results are instructive for the local woodland planning.展开更多
The soil environment quality of woodland with different parent materials(limestone,dolomite limestone,limestone shale,dolomite,limestone sand inclusion shale) in Kasta mountain area was assessed with Analytic Hierarch...The soil environment quality of woodland with different parent materials(limestone,dolomite limestone,limestone shale,dolomite,limestone sand inclusion shale) in Kasta mountain area was assessed with Analytic Hierarchy Process and Principal Component Analysis methods.The results indicated that the soil fertility quality of the soil developed from limestone shale was the best,and the soil developed from dolomite limestone was the worst.The soil developed from limestone shale showed the best heavy metals quality,and the soil developed from dolomite was the worst.The soil developed from limestone shale had the best stand condition quality,and the soil developed from limestone sand inclusion shale was the worst.The results also showed that the order of the soil environment quality was: limestone shale>limestone>dolomite limestone>dolomite>limestone sand inclusion shale.展开更多
基金Sponsored by National Natural Science Foundation of China(31360119,31460112)2015 Innovative Experimental Project for Students in Tibet Agriculture&Animal Husbandry University2015 Pilot Project of Excellent Agriculture and Forestry Talents Cultivation Program Reform
文摘Nitrogen deposition was simulated from July 2014 to August 2015 in the grassland, woodland, and woodland-grassland border in Zhuqudeng Village, Bujiu Township, Linzhi County,(CK, 0 kg·hm^2·a^(-1); LN, 25 kg·hm^2·a^(-1), MN, 50 kg·hm^2·a^(-1); HN, 150 kg·hm^2·a^(-1)). NH_4NO_3 was used as nitrogen source to analyze the number of microorganisms in soil layers of 0–20 cm and 20–40 cm and explore the effect of different degrees of nitrogen deposition on soil microorganisms in grassland, woodland, and woodlandgrassland border. The results showed that: the number of bacteria in the grassland increased significantly under the treatment of LN, and the number of bacteria in the woodland-grassland border and woodland had a rising response under the influence of nitrogen deposition; the number of actinomycetes in the grassland increased in MN and HN treatment, and significantly increased in the border and woodland under LN treatment; the number of molds decreased sharply in the grassland, woodland, and woodland-grassland border.
基金Sponsored by National Youth Natural Science Foundation of China(41301235)
文摘Upland red soil has strong acidity and low fertility, different woodland types produce varying impacts on soil properties and nematode communities. To explore the response of soil, 2 different types of woodland were selected to investigate the changes of soil properties and nematode communities compared to wasteland. The results showed that the content of soil organic carbon and total nitrogen in chestnut forest soil were the highest, 16.41 g/kg and 0.46 g/kg respectively; while the highest contents of soil microbial biomass carbon, nitrogen and phosphorus appeared in wasteland soil, and basal respiration of wasteland soil was 28.36 mg CO_2/kg·d, significantly higher than that of the other 2 soils(p <0.05). The nematode abundance also reached the peak in wasteland soil. Three types of soil exhibited a completely different nematode community structure: the dominant trophic group in wasteland soil was herbivores,while omnivores/predators and bacterivores in forest from farmland and chestnut forest soil, respectively.The influence of different types of woodland on ecological indices of nematode communities was not consistent. Degradation trends of soil properties and nematode communities were presented in the 2woodland types compared with wasteland soil. These results are instructive for the local woodland planning.
文摘The soil environment quality of woodland with different parent materials(limestone,dolomite limestone,limestone shale,dolomite,limestone sand inclusion shale) in Kasta mountain area was assessed with Analytic Hierarchy Process and Principal Component Analysis methods.The results indicated that the soil fertility quality of the soil developed from limestone shale was the best,and the soil developed from dolomite limestone was the worst.The soil developed from limestone shale showed the best heavy metals quality,and the soil developed from dolomite was the worst.The soil developed from limestone shale had the best stand condition quality,and the soil developed from limestone sand inclusion shale was the worst.The results also showed that the order of the soil environment quality was: limestone shale>limestone>dolomite limestone>dolomite>limestone sand inclusion shale.
