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研究不同氮(N)、磷(P)和水分梯度上植物枯叶的N和P浓度及C:N和C:P的响应格局,对于预测N沉降增加和降水格局改变对枯叶分解乃至养分循环的潜在影响具有一定的实践意义。该研究通过3个盆栽控制试验(N、P添加试验:0、0.5、1.0、2.0、4.0、8.0、16.0、32.0、64.0和128.0gN(P)·m?210个水平;控水试验:3600、3900、4500、5100、6000、7200、9000、12000、18000和36000mL·pot?110个水平),探讨了这些环境因子改变对羊草(Leymuschinensis)枯叶分解质量的影响。结果表明,在一定范围内,N添加提高了羊草枯叶的N浓度,降低了C:N,对P浓度和C:P没有明显的影响;P添加提高了枯叶的N和P浓度,降低了C:N和C:P;供水量增加显著降低了枯叶的N和P浓度,提高了C:N和C:P。这表明,N、P和水分因子的改变影响了植物枯叶的性状,且不同梯度的影响程度不同。因此,全球气候变化可能影响植物枯叶的分解质量,进而可能改变植被-土壤系统的养分循环。
The responses of N and P concentrations and C: N and C: P responses in different dead leaves of different nitrogen (N), phosphorus (P) and water gradients were studied to predict the increase of N deposition and the change of precipitation pattern on the decomposition of leaves and even nutrients The potential impact of the cycle has some practical significance. The study adopted three pot control experiments (N, P addition test: 0,0.5,1.0,2.0,4.0,8.0,16.0,32.0,64.0 and 128.0gN (P) m? 210 levels; water control test: 3600 , 3900, 4500, 5 100, 6000, 7200, 9000, 12000, 18000 and 36000 mL pot of 110 levels). The effects of these environmental factors on the decomposition of dead leaves of Leymus chinensis were discussed. The results showed that within a certain range, N addition increased the N concentration of Leymus chinensis leaves, decreased C: N, had no obvious effect on P concentration and C: P; P addition increased N and P concentrations in dead leaves, Decreased C: N and C: P; increased water supply significantly reduced N and P concentrations in dead leaves and increased C: N and C: P. This indicates that the changes of N, P and water factors affect the traits of plant dead leaves, and the influence of different gradients is different. As a result, global climate change may affect the quality of decomposition of plant dead leaves, which in turn may change the nutrient cycle of the vegetation-soil system.