CAJ | 학술논문

采用LAI-2000冠层分析仪对不同修枝高度处理条件下杉木人工幼林光环境及叶面积指数的动态变化进行了分析,并探讨了生长量的修枝效应,初步得到4点主要结论:(1)修枝明显提高了林内透光率,林内透光率随着修枝强度的增大而增大,且修枝强度愈大,林内透光率恢复至干扰前状态的趋势愈明显;(2)修枝明显降低了林分叶面积指数,随着修枝强度的增大,林分叶面积指数呈线性下降,修枝强度高的林分叶面积指数的增长百分率相对愈高,修枝所引起的林分叶面积指数下降的程度远远低于林分透光率的增大;(3)不同修枝强度对隔行修枝林分的总生长量影响不显著,但过度修枝会对修枝木胸径生长产生抑制,而对修枝木高生长影响不显著;(4)强度为40%的修枝方式以约20%的叶面积损耗换取了透光率1倍左右的提高,且对修枝木材积生长影响不显著.
채용LAI-2000관층분석의대불동수지고도처리조건하삼목인공유림광배경급협면적지수적동태변화진행료분석,병탐토료생장량적수지효응,초보득도4점주요결론:(1)수지명현제고료림내투광솔,림내투광솔수착수지강도적증대이증대,차수지강도유대,림내투광솔회복지간우전상태적추세유명현;(2)수지명현강저료림분협면적지수,수착수지강도적증대,림분협면적지수정선성하강,수지강도고적림분협면적지수적증장백분솔상대유고,수지소인기적림분협면적지수하강적정도원원저우림분투광솔적증대;(3)불동수지강도대격행수지림분적총생장량영향불현저,단과도수지회대수지목흉경생장산생억제,이대수지목고생장영향불현저;(4)강도위40%적수지방식이약20%적협면적손모환취료투광솔1배좌우적제고,차대수지목재적생장영향불현저.
The dynamics of light environment and leaf area index (LAI) of Chinese fir young plantations under the condition of different pruning height treatment were studied using canopy analyzer LAI-2000, and the effects of pruning on stands growth were discussed. Four main conclusions were gotten. (1)Pruning obviously improved stands light transmission rate, the canopy light transmission rate increased with the increasing of pruning intensity, and the bigger the pruning intensity was, the more obvious the restoration trendency of canopy light transmission rate was with the stands growth. (2)Pruning obviously decreased LAI, LAI presented a linear descent with the increasing of pruning intensity, the increasing percent of LAI was higher for stands with high pruning intensity than ones with low pruning intensity, and the effect degree of pruning on LAI was far lower than on canopy light transmission rate. (3)Pruning intensities had not produced significant effect on gross growth for every other one row pruning treatment, the excessive pruning could significantly decrease the breast-height diameter of the pruning trees, but had not significant effect on height. (4)Only with the 20% leaf area loss, the 40% pruning intensity could make canopy light transmission rate increase one times or so, and this pruning intensity hadn't significant effect on timber volume of the pruning trees.