摘要
研究四川省柏木人工林叶C、N、P化学计量特征及其对立地变化与龄组的响应,对深入理解各龄组柏木叶在不同立地类型中的养分分配格局有重要意义。为确定立地和龄组对柏木人工林叶化学计量特征的影响,对柏木人工林主要分布区70个标准地进行立地分类,采集幼龄林、中龄林和近熟林柏木叶测定其C、N、P含量。结果显示:(1)研究区共划分为2个小区、4个组、8个亚组及17个立地类型。(2)四川省柏木人工林平均叶C、N、P含量分别为(550.55±18.08)g·kg^(-1),(9.39±0.20)g·kg^(-1),(0.95±0.12)g·kg^(-1),C∶N,C∶P,N∶P分别为58.70±3.04,583.68±44.59,9.93±0.37,均受立地与龄组的显著影响(P<0.05)。(3)同一龄组内,与N、P含量相反,叶C含量、C∶N、C∶P在山地小区显著高于丘陵小区;各小区内酸性紫色土组显著高于石灰性紫色土组;丘陵小区各组内坡下部亚组显著高于坡中上部和坡顶台地亚组,且厚土层类型显著高于中土层类型;山地小区酸性紫色土组内阳坡亚组显著高于阴坡亚组,且沟槽类型显著高于坡地、脊梁类型。(4)同一立地内,从幼龄林到近熟林柏木叶C含量、C∶N和C∶P不断上升,N、P含量不断下降,柏木生长可能受N限制且生长前期更明显。综上所述,建议柏木造林选地以山地阳坡沟槽或丘陵坡下部土层较深厚的酸性紫色土为佳,生长前期施N肥以缓解可能受到的营养限制。
The experiment was conducted to study the leaf C,N,P stoichiometric characteristics of Cupressus funebris plantations in Sichuan Province and their responses to site change and age group for understanding theleaf nutrient distribution patterns of C.funebris in different age groups and site types.In order to determine theeffects of site and age group on the leaf stoichiometric characteristics of C.funebris plantations,70 standardplots were selected for the site classification in the main distribution areas of C.funebris plantations.Leaves from different age groups(young stand,half-mature stand,and near mature stand)of C.funebris were collected,andthe C,N,P contents of leaf were measured respectively.The plots were classified into 2 site type districts,4 site type groups,8 site type subgroups and 17 site types.The average leaf C,N,P contents of C.funebris inSichuan were(550.55±18.08)g·kg^(-1),(9.39±0.20)g·kg^(-1),(0.95±0.12)g·kg^(-1),and the C∶N ratio,C∶Pratio,N∶P ratio of which were 58.70±3.04,583.68±44.59,9.93±0.37,respectively.Leaf C,N,P contentsand C∶N,C∶P,N∶P ratios were all affected by site type and age group significantly(P<0.05).Within the sameage group,the leaf C content,C∶N ratio and C∶P ratio of C.funebris in the mountainous site type district weresignificantly higher than those in the hill site type district;in the acid purple soil site type group weresignificantly higher than those in the calcareous purple soil site type group in each district;in the lower slopesite type subgroup were significantly higher than those in the middle and upper slope site type subgroup and thetop slope site type subgroup in each group of hill site type district;in the thin soil site type of hill site typedistrict were significantly higher than those in the medium soil site type;in the sunny slope site type subgroupwere significantly higher than those in the shady slope site type subgroup in each group of mountainous site typedistrict;and in the groove site type of mountainous site type district were significantly higher than those in theslope and ridge site type,however,the leaf N and P contents of C.funebris showed the opposite trends.Withinthe same site type,the leaf C content,C∶N ratio and C∶P ratio increased continuously,and the N and Pcontents decreased continuously from the young stand to the near mature stand.The growth of C.funebris plantations may be restricted by N and more obvious in the early growth stage.In summary,we suggested tocultivate the C.funebris plantations in the site conditions such as the combination of"acid purple soil in grooveon sunny slope of mountain"or"thin acid purple soil on lower slope of hill",and apply N fertilizer in earlygrowth stage to alleviate the possible nutritional restrictions.
作者
宋思梦
周扬
张健
SONG Si-Meng;ZHOU Yang;ZHANG Jian(Agricultural College,Sichuan Minzu College,Research Center for Ecological Restoration and Characteristic Industry Cultivation in Hengduan Mountains Region,Kangding 626001;Institute of Ecology&Forestry,Sichuan Agriculture University,Monitoring Station for Ecoenvironments in the Rainy Zone of Southwest China,Chengdu 611130;Key Laboratory of Ecological Forestry Engineering of Sichuan Province,Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River,Chengdu 611130)
出处
《植物研究》
CAS
CSCD
北大核心
2021年第5期760-774,共15页
Bulletin of Botanical Research
基金
国家自然科学基金项目(31370628)
国家科技支撑计划项目(2011BAC09B05)
四川省科技支撑计划项目(12ZC0017)
四川省科技厅应用基础项目(2012JY0047)
四川省教育厅科技创新团队计划项目(11TD006)
四川民族学院特色科研孵化项目(KBFHB19014)
四川民族学院自办科研项目“不同水肥耦合处理下巨菌草的生物量和农艺性状”。
关键词
生态化学计量学
柏木人工林
叶
立地类型
龄组
ecology stoichiometry
Cupressus funebris plantation
leaf
site type
age group
