Ecological stoichiometric characteristics of typical forest stands in the Loess Hilly Region of southwest Shanxi
[Objective]This study,with an investigation of the ecological stoichiometry characteristics of plant-litter-soil in typical forest stands in the Loess Hilly Region of China,is aimed to reveal the main limiting nutrient elements for the growth and development of vegetation in the ecosystem in this region.[Method]With a natural secondary forest of Quercus liaotungensis as the control,a systematic analysis was conducted of the ecological stoichiometric characteristics and their correlation between tree leaves,branches,roots,litter and soil in the forest of Pinus tabuliformis,Robinia pseudoacacia and Platycladus orientalis in Loess Hilly Region.[Result](1)The overall contents of C,N and P in different organs in typical stands were leaves＞branches＞roots,and compared with C content,the content of N and P varied greatly between different organs with the C content of P.tabuliformis organs being substantially higher than other forest stands(P＜0.05)and the N contents of leaves,roots,litter and soil of R.pseudoacacia being significantly higher than other forest stands(P＜0.05).(2)R.pseudoacacia leaf C/N and C/P were significantly lower than other forest stands(P＜0.05),with N/P being between 14 and 16,while leaf N/P of all other stands was lower than 14 and litter N/P was lower than 25.(3)C and N contents of all plant organs in typical stands were prominently positively correlated with litter C and N content(P＜0.05),while plant P was significantly negatively correlated with litter and soil P content;soil C content was significantly negatively correlated with litter C content(P＜0.05)but positively correlated with litter N content(P＜0.05)and there was a significant negative correlation between litter C/N,C/P and soil C/N,C/P and N/P respectively(P＜0.05).[Conclusion]Plant growth and development and litter decomposition in typical stands in the loess hills were mainly limited by N.And R.pseudoacacia forests should be selected and protected in the vegetation restoration in the Loess Hilly Region as its growth rate is the highest and the litter is easier to decompose.[Ch,3 fig.1 tab.30 ref.]
万方数据
维普
