模拟降水变化和土壤施氮对浙江古田山5个树种幼苗生长和生物量的影响

发布时间：2018-04-25 09:08

本文选题：生物量 + 生物量分配　；参考：《植物生态学报》2011年03期

【摘要】：为了探讨古田山地区5个树种-秃瓣杜英(Elaeocarpus glabripetalus)、枫香(Liquidambar formosana)、木荷(Schima superba)、青冈(Cyclobalanopsis glauca)和马尾松(Pinus massoniana)幼苗的生长和生物量及其分配对添加氮肥和减少降水的响应,在野外设置了双因素氮肥(对照和施氮)和降水(自然降水(对照)和减少降水)控制试验,氮肥的施入量为10g·m-2·a-1NH4NO3,分别于每年5月初和7月初各施5g·m-2·a-1,减少降水处理是减少自然降水的30%。经过3个生长季的处理发现:1)施氮显著促进了秃瓣杜英、枫香和木荷的苗高和基径的生长,并且对秃瓣杜英和枫香的促进作用经过1个生长季的处理就表现出来,而木荷在经过2个生长季后才表现出来;2)施氮显著促进了秃瓣杜英、枫香和木荷的全株生物量以及各部分生物量的增长,而只增加了马尾松的侧枝和叶片生物量以及青冈的侧枝生物量;3)2个生长季的施氮处理提高了秃瓣杜英和木荷的叶重比以及枫香和青冈的枝重比,3个生长季的施氮处理促进了秃瓣杜英、枫香和木荷的茎重比以及青冈和马尾松的枝重比,地上干物质分配比例的增加以地下干物质分配比例减小为代价,施氮后显著降低了秃瓣杜英、枫香、木荷和青冈的根重比和根冠比;4)降水减少30%对各树种的生长均无显著影响。
[Abstract]:In order to study the growth and biomass of five tree species, Elaeocarpus glabripetalus, Liquidambar formosanaana, Schima superbaa, Cybalanopsis glauca and Pinus massoniana, in Gutian Mountains, the growth and biomass of seedlings and their distribution response to nitrogen fertilizer and precipitation reduction were studied. Two factors nitrogen fertilizer (control and application of nitrogen) and precipitation (natural precipitation (control) and precipitation reduction) control experiments were conducted in the field. The amount of nitrogen fertilizer applied was 10g m-2 a-1NH4NO3, which was applied at the beginning of May and early July, respectively. Reducing precipitation treatment was 30% of natural precipitation. After three growing seasons, it was found that nitrogen application significantly promoted the growth of seedling height and basal diameter of Alopecten, Maple and Schima superba, and promoted the growth of alopecium alopecuroides and Maple by one growing season. Nitrogen application significantly promoted the growth of the whole plant biomass and the biomass of all parts of Alopecten, Maple and Schima superba. The biomass of lateral branch and leaf of Pinus massoniana and the biomass of lateral branch of Cyclobalanopsis were increased only by N application in 2 growth seasons. The ratio of Alopecia alopecuroides and Ye Zhong of Schima superba, the ratio of shoot weight of Maple and Cyclobalm, and the nitrogen application rate of 3 growing seasons were increased. The treatment promoted alopecia duying, The ratio of stem to weight of Maple and Schima superba and the ratio of shoot weight to shoot weight of Cyclobalanthus and Pinus massoniana increased at the cost of decreasing the proportion of dry matter distribution in the ground. The ratio of root weight to root weight and ratio of root to shoot of Schima superba and Cyclobalanopsis davidii decreased by 30%, and the growth of each tree species was not significantly affected by 30% of precipitation.
【作者单位】：中国科学院植物研究所植被与环境变化国家重点实验室;中国科学院研究生院;古田山国家级自然保护区管理局;
【基金】：国家自然科学基金(30590382和40631002)资助
【分类号】：Q945

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