【摘要】 研究了土壤有机质及全氮在霍林河中下游的科尔沁和向海两个自然保护区湿地表层土壤中的水平分布及其在土壤剖面中的垂直分布特征。结果表明 ,与科尔沁自然保护区相比 ,向海自然保护区的空间分异程度较高 ,其表层对有机质及全氮的持留作用较强 ,碳的固定速度比氮累积更慢一些 ;盐碱化程度较高 ,湿地植被净化效应较显著 ;pH值对有机质和全氮的影响也更为显著。更多还原

【Abstract】 This paper studied the vertical discribution characteristics of soil organic matter and total nitrogen in soil profiles, and their horizontal distribution characteristics in the surface soil of wetlands in Xianghai Nature Reserve and Horqin Nature Reserve, respectively. The results show that, in contrast to Horqin Nature Reserve, there exists higher spatial variation for soil organic matter and total nitrogen in Xianghai Nature Reserve, their variation coefficients can be more than 90%; moreover its surface soil holds more soil organic matter and nitrogen in Horqin wetland; its rate of carbon fixing is slower than that of nitrogen accumulation in Xianghai wetland; its degree of salinity is also more severe than, Horqin wetland and its wetland plants in Xianghai assimilate more salts than those in Horqin wetland; in addition, the distribution of soil organic matter and total nitrogen is influence by pH values more strongly.更多还原