The order of water - holding capacities in different plantations was as follows : altinglia gracilipes > schima superba > fokienia hodginsii > cunninghamia lanceolata 不同林分的持水量大小排序为：细柄阿丁枫杉木混交林木荷杉木混交林建柏杉木混交林杉木纯林。
Ii ) some native spcies , eg . crateagus wilsonii , cerasus szechuanica , malus prati , toxicodendron verniciflua , are dominants and co - edificators in almost every woody communities 2 )华中山楂、四川樱桃、川滇海棠、漆树等乡土树种在几乎所有木本群落阶段(针叶纯林除外)都是优势种或共建种。
The mangrove bushes of 0 . 26 acres located along the coast of keya river , adjacent to the exit of the west coastal expressway is an aggregation of many organisms in high density 位于虎山里西滨快速道路下，客雅溪沿岸旁，有一片面积0 . 26公顷的水笔仔纯林，是许多生物聚集点，生物的密度非常高。
The tong - term tune bests of pinus yunnanensis management lead to bio - diversity decrease , diseases and insect pests damage , genetic degradation , and productivity decline 摘要长期以来，云南松的纯林经营使得生物多样性降低、林分稳定性变差、遗传品质退化、林分生产力下降，从而导致生态系统功能衰退。
The strategy and measures to prevent the soil degradation of pinus sylvestris var . mongolica were put forward , including application of thinning rationally for existing dense plantations and establishment of mixture forest for new plantations 解决当前人工林退化的主要措施是因地制宜进行间伐或轮伐，改善林地微生态条件，尽量避免营造人工纯林，建议营造混交林。
Iii ) for artificial communities including herbaceous community , pure conifer and needle broad - leaved mixed forest , the poor niche configuration and serious niche overlap of component species made the composition structure of community be in an unstable state 3 )人工构建的群落(包括草本群落、针叶纯林和针阔混交林)其组成物种生态位配置差，生态位重叠大，造成群落组成结构不稳定。
Acceding to the domestic and overseas experience , the technology and theory of approaching - nature forest management d the pure forests are discussed in the paper , to provide gist for restoring the ecological function and economic benefit of the community 针对这些实际情况，本文依据国内外研究成果对云南松纯林近自然化改造的技术和理论进行了探讨，为恢复云南松群落的生态功能和经济功能提供依据。
The water - holding capacity of altinglia gracilipes , schima superba , fokienia hodginsii and cunninghamia lanceolata planted under cunninghamia lanceolata ecological public welfare forest was studied from forest canopy , shrub and herb layer , litter layer and soil layer 摘要分别从林冠层、林下植被层、凋落物层及土壤层对杉木人工生态公益林林冠下营造的细柄阿丁枫、木荷、建柏和杉木纯林的持水功能进行了研究。
Experimental plots were established for thinning effects on stand and tree growth , tree species composition , species diversity and soil factors etc . in the mixed larch - spruce - fir stands which originated from planted larch pure forest by observations for 12 years after thinning 摘要以15块人工落叶松纯林演化后形成的落叶松云冷杉混交林为对象，间伐后12年观测结果，研究间伐对林分和树木生长、树种组成、物种多样性及土壤等因子的影响。
Abstract : through a study on soil aggregate composition , nutrient status and enzymatic activity under mixed forest of chinese fir alniphyllum fortunei and pure stand of chinese fir , the results indicated that , compared to pure stand , the soil structural property was ameliorated , the soil capacity of nutrient supplying and was improved , and the soil enzymatic activity were enhanced 文摘:通过对杉木拟赤杨混交林及杉木纯林土壤团聚体结构、土壤养分状况及酶活性的研究表明，与杉木纯林相比，混交林土壤结构性能得到改善，供肥和保肥能力加强，各种土壤酶活性提高，土壤肥力较好。
