摘要
海拔对植物养分元素的分配和生存策略的权衡具有重要影响.为了解金佛山方竹(Chimonobambusa utilis)叶片氮、磷养分对海拔梯度的响应,以四川盆地南缘3个海拔(1 400 m、1 600 m和1 800 m)金佛山方竹纯林为研究对象,建立12个典型样地,对生长季节叶片氮、磷含量和土壤养分含量、温度、含水量等进行定量研究和相关性分析.结果表明:(1)随海拔的升高,叶片氮含量呈上升趋势,叶片磷含量呈下降趋势,叶片氮磷比呈上升趋势;各海拔叶片氮磷比均大于16,表明金佛山方竹生长可能受到磷限制.(2)冗余分析表明,叶片氮含量和氮磷比与土壤温度、含水量和速效磷含量呈负相关,与土壤速效氮含量呈正相关;叶片磷含量与土壤全氮和速效氮含量呈负相关,与其余环境因子呈正相关;土壤温度、速效氮、全氮、含水量和速效磷含量对叶片氮、磷化学计量特征整体影响显著,变量解释度分别为72.10%、7.90%、8.80%、2.50%和1.20%.(3)相对重要性分析表明,土壤温度和速效氮含量是叶片氮含量变异的主导因子,土壤温度、速效磷和全氮含量是叶片磷含量变异的主导因子,土壤温度、速效磷含量和速效氮含量是叶片氮磷比变异的主导因子.上述研究结果说明,海拔引起的土壤温度和养分供应的差异调节着金佛山方竹叶片的氮、磷化学计量特征.(图4表3参49)
Elevation plays a significant role in nutrient allocation and survival strategy trade-offs in plants. To understand the response of nitrogen(N) and phosphorus(P) content in the leaves of Chimonobambusa utilis to the elevation gradient, 12 typical plots were set up in three pure forests of C. utilis at elevations of 1 400 m, 1 600 m, and 1 800 m on the southern edge of the Sichuan Basin, and leaf N and P contents and environmental factors(e.g., soil temperature, moisture, pH, and nutrient content) in the growing season.The results showed the following:(1) With an increase in elevation, the leaf N content and N/P ratio of C.utilis increased, while the P content decreased. The leaf N/P ratio was higher than 16 at all elevations, which indicated that P easily restricted the growth of C. utilis.(2) The results of redundancy analysis showed that leaf N content and N/P ratio were negatively correlated with soil temperature, moisture, and available P content, but positively correlated with soil available N content. There was a negative correlation between leaf P content and soil total N and available N content but a positive correlation with other environmental factors. Soil temperature,available N content, total N content, moisture, and available P content had a significant influence on the overall leaf N and P stoichiometric characteristics of C. utilis, and their variable interpretation degrees were 72.10%,7.90%, 8.80%, 2.50%, and 1.20%, respectively.(3) Relative importance analysis showed that soil temperature and available N content were the main factors affecting leaf N content. The main factors affecting variation in leaf P content were soil temperature, available P content, and total N content. The main factors affecting the variation in leaf N/P ratios were soil temperature, available P content, and available N content. Our results indicate that variations in soil temperature and nutrient supply caused by elevation regulated the leaf N and P stoichiometry characteristics of C. utilis.
作者
刘雄
向玲
赵丹蕊
黄杰
周凡博
廖娇
兰素芯
杜美霖
周艺琳
黄从德
LIU Xiong;XIANG Ling;ZHAO Danrui;HUANG Jie;ZHOU Fanbo;LIAO Jiao;LAN Suxin;DU Meilin;ZHOU Yilin;HUANG Congde(College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Chengdu 611130,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2022年第4期1012-1018,共7页
Chinese Journal of Applied and Environmental Biology
基金
四川省“十三五”农作物及畜禽育种攻关项目(2016NYZ0038)
四川省大学生创新创业训练计划项目(201910626127)资助。
关键词
金佛山方竹
氮磷
海拔
化学计量
冗余分析
相对重要性分析
Chimonobambusa utilis
nitrogen and phosphorus
elevation
stoichiometric characteristic
redundancy analysis
relative importance analysis
