Effects of field simulation of precipitation changes on soil nitrogen availability under a Mongolian pine plantation at Horqin Sandy Lands in Northeast China
Rainout shelters and irrigation systems were manipulated in a Mongolian pine plantations to simulate changes in precipitation amount and to explore how it would affect soil N availability in in Keerqin Sandy lands. Both reduced (RP) and increased (IP) precipitation treatments significantly affected soil inorganic N concentration, increasing it through the growing season under RP treatment, and decreasing it under IP treatment, in most growing season. Soil microbial biomass N in each month was significantly reduced by RP and raised by IP. Mongolian pine growth and root biomass were significantly reduced by precipitation decrease, while they had no significant response to precipitation increase. Above ground net primary productivity was reduced by precipitation decrease and was increased by precipitation increase significantly. Results indicated the asynchrony of soil moisture and soil nutrient availability in Mongolian pine plantations. Water availability is the overriding limiting factor on grass growth in Horqin Sandy Lands when precipitation decrease, and N limitation became increasingly important when precipitation increase.
Dongzhou DENG Xinhou ZHANG Xuekai SUN
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate Universit Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate Universit Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
国际会议
成都
英文
1-5
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）