不同立竹密度毛竹林的笋生长及碳积累特征研究
Characterization of shoot growth and carbon accumulation in moso bamboo based on different stand densities
[目的]密度调控是提质增效、节约经营成本的最佳经营措施，明确立竹密度对毛竹林出笋、春笋生长及笋期碳积累的影响，为研究毛竹整个生长周期的固碳特征以及科学调控毛竹林经营提供理论依据。[方法]在江苏宜兴国有林场设置四种立竹密度毛竹林样地，分别为D1(1400±100 株/hm2)、D2(20 00±100 株/hm2)、D3(2600±100 株/hm2)、D4(3200±100 株/hm2)，每个密度设置 3 个重复，共 12 块样地。于 2023年4月 9日开始每隔 3日对各样地出笋进行全面调查，于4 月15日开始每隔6日进行春笋取样，采用Kaplan-Meier生存分析法对春笋生长进行分析，运用logistic生长函数对不同立竹密度春笋碳积累进行拟合。[结果]①总出笋株数随立竹密度增加而降低，出笋高峰期的出笋数表现为 D1＞D3＞D4＞D2。②出笋期内高密度毛竹林累积生存率及平均存活时间都大于低密度毛竹林，具体表现为D4＞D2＞D3＞D1。③出笋观测期第9～21天时，各密度样地均大量退笋。④春笋碳积累量表现为D1＞D4＞D2＞D3。[结论]立竹密度影响了毛竹林出笋数量、样地内毛竹笋生长时间和毛竹笋期碳积累，低立竹密度毛竹林(D1)具有更多的出笋数及笋期碳积累量，高立竹密度毛竹林(D4)具有更长的毛竹笋生长时间。
[Objective]Density control is the best management measure to improve quality and efficiency,and to save operation cost.To clarify the influence of standing bamboo density on the carbon accumulation in the shoots,spring shoots and shoot stage of moso bamboo forests,so as to provide a theoretical basis for the study of carbon sequestration characteristics of moso bamboo in the whole growth cycle as well as for the scientific control of the moso bamboo forests operation.[Methods]Four kinds of standing bamboo densities of moso bamboo forests were set up in Yixing State Forestry Farm in Jiangsu Province,namely,D1(1400±100 plants/hm2),D2(2000±100 plants/hm2),D3(2600±100 plants/hm2)and D4(3200±100 plants/hm2),and three replications were set up for each density,with a total of 12 sampling plots.On April 9,2023,we conducted a comprehensive survey of shoot emergence in each plot every 3 days,and on April 15,we sampled spring shoots every 6 days.We analyzed the growth of spring shoots by Kaplan-Meier survival analysis,and fit the logistic growth function to the carbon accumulation of spring shoots with different standing bamboo densities.[Results]①The total number of bamboo shoots decreased with the increase of bamboo density,and the number of bamboo shoots during the peak period was D1＞D3＞D4＞D2.②The cumulative survival rate and average survival time of high-density moso bamboo forests were greater than those of low-density moso bamboo forests during the period of bamboo shoots,which were D4＞D2＞D3＞D1.③The number of bamboo shoots in each density sample site retreated from the 9th to the 21st day of bamboo shoots observation period.The carbon accumulation of spring bamboo shoots was D1＞D4＞D2＞D3.[Conclusion]The density of standing bamboo affected the number of bamboo shoots,the growth time of bamboo shoots in the sample plots and the carbon accumulation of bamboo shoots in the bamboo shoot period,and the low-density bamboo forest(D1)had more number of bamboo shoots and bamboo shoots carbon accumulation,while the high-density bamboo forest(D4)had a longer time of bamboo shoots growth.
张璇;官凤英;周潇;厉振;傅大伟;黎旻恺;
国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;国际竹藤中心 国家林业和草原局/北京市共建竹藤科学与技术重点实验室 中国 北京 100102##江苏宜兴竹林林生态系统国家定位观测研究站宜兴 214200;
立竹密度 春笋生长 生存分析 logistic生长函数 碳积累
bamboo density spring shoot growth survival analysis logistic growth function carbon accumulation
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