摘要
【目的】研究黄土丘陵区典型林分植物-凋落物-土壤的生态化学计量特征,可揭示该地区生态系统植被生长发育的主要限制性营养元素。【方法】选取黄土丘陵区典型人工油松Pinus tabuliformis林、刺槐Robinia pseudoacacia林、侧柏Platycladus orientalis林为研究对象,天然次生辽东栎Quercus liaotungensis林为对照,分析不同林分植物叶、枝、根,凋落物和土壤的生态化学计量特征及其相关性。【结果】①典型林分的乔木各器官碳(C)、氮(N)、磷(P)质量分数从大到小依次表现为叶、枝、根,与C相比,各器官间N、P质量分数变化幅度较大;油松各器官C质量分数显著高于其他林分(P<0.05);刺槐叶、根、凋落物和土壤N质量分数显著高于其他林分(P<0.05),刺槐具有较好的固氮作用。②刺槐叶C/N和C/P显著低于其他林分(P<0.05),叶N/P为14~16,其他林分叶N/P均低于14;凋落物N/P低于25,分解受N元素限制;③典型林分的植物各器官C、N与凋落物C、N显著正相关(P<0.05),而P与凋落物和土壤P无显著相关性;土壤C与凋落物C呈显著负相关(P<0.05),而与凋落物N呈显著正相关(P<0.05);凋落物C/N、C/P与土壤C/N、C/P、N/P分别呈显著负相关(P<0.05)。【结论】黄土丘陵区典型林分植物生长发育和凋落物的分解主要受N元素限制。刺槐具有良好的固氮作用且生长速率较快,在该地区人工林植被恢复中可着重选择和保护。
[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.
作者
辛鹏程
魏天兴
陈宇轩
于欢
沙国良
郭鑫
任康
XIN Pengcheng;WEI Tianxing;CHEN Yuxuan;YU Huan;SHA Guoliang;GUO Xin;REN Kang(Jixian Research Station for Forest Ecosystem,Chinese National Ecosystem Research Network,School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology,Internation Center for Bamboo and Rattan,Beijing 100102,China)
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2024年第3期549-556,共8页
Journal of Zhejiang A&F University
基金
国家重点研发计划项目(2022YFF1300401)。
关键词
生态化学计量
人工林
养分循环
养分限制
ecological stoichiometry
plantation
nutrient cycling
nutrient limitation
