Nutrient Release Characteristics during Decay of Mixed Leaf Litter of Pinus sylvestris var.mongolica with Other 10 Tree Species
Establishment of mixed forests is an essential way to improve the stability of forest ecosystem.In order to select appropriate tree species for mixing with Pinus sylvestris var.mongolica,leaf litters from P.sylvestris var.mongolica and other 10 tree species were collected.The litter samples were cleaned,air-dried,and then cut and mixed with 1∶ 1 ratios.The mixed litters were placed in nylon litterbags and incubated in the potting soil for a 345-day decay period under constant temperature and moisture in lab.The weight and concentrations of 8 nutrient elements in the litters before and after the decay were determined.The results showed:the leaf litter of P.sylvestris var.mongolica had the poorest substrate quality with the highest C concentration and C/N ratio,but the lowest N concentration; The mixed leaf litter decay had greater impacts on microelement release than on macro-elements; Mixture of leaf litters from Platycladus orientalis,Larix principis-rupprechtii,Ulmus pumila or Hippophae rhamnoides with that from P.sylvestris var.mongolica accelerated the release of C,N,P,Cu,Zn,Fe and Mn; Mixture of leaf litters from Populus simonii with that from P.sylvestris var.mongolica accelerated the release of N,P,Cu,Zn,Fe and Mn; Mixture of leaf litters from Caragana microphylla with that from P.sylvestris var.mongolica accelerated the release of C,N,P,Cu and Fe,and mixture of leaf litters from Amorpha fruticosa with that from P.sylvestris var.mongolica accelerated the release of N,P,Cu and Zn.According to a comprehensive analysis,mixed litters of P.sylvestris var.mongolica respectively with L.principisrupprechtii,H.rhamnoides,P.orientalis and U.pumila showed positive impacts on decay and nutrient release,but negative influences when mixed with R.pseudoacacia,B.platyphylla and Q.liaotungensis.
国家科技期刊平台
NSTL
万方数据
维普
