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毛竹枝叶生物量的冠层分布对钩梢和施肥的响应

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以浙江省不钩梢和钩梢2种不同营林模式下的毛竹Phyllostachys heterocycla cv.pubescens为研究对象，并设置施肥处理，对林地毛竹枝、叶生物量在冠层的分布进行了研究。结果表明：不钩梢毛竹枝、叶和枝叶总生物量在冠层上的分布符合Peel-Reed模型，而钩梢毛竹符合二次曲线分布；施肥增加毛竹枝、叶生物量，在钩梢与不钩梢之间存在差异，前者在各枝盘上，枝生物量的增加均大于叶，而后者在主要枝盘（≥8枝盘）上枝生物量的增加则小于叶；毛竹叶枝比在钩梢或不钩梢毛竹上总体表现为随着枝盘数的增加而递增，但钩梢毛竹在所有枝盘上的叶枝比均小于1；施肥表现为相对地增大了冠层中下部（如不钩梢23～30枝盘和钩梢1～9枝盘）的叶枝比；钩梢（剩余14枝盘）毛竹叶片生物量仅为不钩梢毛竹的58.99%，且树冠形状呈倒三角形，不利于冠层叶片充分利用光资源；施肥在一定程度可改善树冠形状，但生产上应适度降低毛竹钩梢强度，保留枝盘数为18～20枝盘，有效保持或提升毛竹叶片生物量。
Responses of branches and leaves biomass distributed in canopy of Phyllostachys heterocycla cv.pubescens forest to obstruction and fertilization
An experiment was performed to study the effects of obtruncation and fertilization on biomass distribution pattern of branches and leaves in canopy ofPhyllostachys heterocycla cv.pubescensin Zhejiang Province in 2004. In 2010 and 2011, total 50 plants were cut down to investigate branch and leaf biomass. The correlation between biomass of branches and leaves and the round numbers of branch were elaborated, Peel-Reed model was suitably simulated for non-obtruncationPhyllostachys heterocycla cv.pubescens (NOPP), and the quadratic curve was suitable for obtruncationPhyllostachys heterocycla cv.pubescens (OPP). Fertilization increased biomass of branch and leaf, but some differences occurred between NOPP and OPP. Biomass of leaf increased more than biomass of branch in NOPP (≥8 round numbers of branch (RNoB)), but it was opposite in total canopy in OPP. The ratio of leaf to branch increased with the increase of round numbers of branch for both NOPP and OPP, while it was smaller than 1 for OPP in total canopy. Fertilization brought about a relatively increase of ratio of leaf to branch in the middle to lower part of canopy for NOPP (such as 23~30 RNoB) and OPP (such as 1~ 9 RNoB). The leaf biomass in OPP accounted for 58.99% of that in NOPP when 1~14 RNoB was retained after obtruncation, and crown shape similarly like an inverted triangle, which was not good for leaf in total canopy to receive the light. Though a better crown shape could be formed after fertilization, reducing the intensity of obtruncation (left 18~20 RNoB) would significantly maintain or increase leaf biomass in management practice.

Phyllostachys heterocyclacv.pubescensbiomass of branches and leavesdistribution pattern in canopycutting top branch of bamboofertilization

朱强根、金爱武、唐世刚、柳丽娜、周婧

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丽水学院，浙江丽水 323000

安吉县林业局，浙江安吉 313300

浙江农林大学林业与生物技术学院，浙江临安 311300

毛竹 枝叶生物量 冠层分布 钩梢 施肥

丽水市科技局高效科研院所基地建设项目丽水市公益性技术应用项目丽水市公益性技术应用项目

2013JDJS012013ZC0012013JYZB09

2015

10.14067/j.cnki.1673-923x.2015.01.005

中南林业科技大学学报
中南林业科技大学

中南林业科技大学学报

CSTPCDCSCD北大核心
影响因子：1.442
ISSN：1673-923X
年,卷(期)：2015.(1)
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