炼山造林

因此，在坡地上进行伐根催腐造林优于炼山造林。（4）林地炼山前后对土壤理化性质的影响（平地）。

Stump rot minder management measure was better than burned on slope land . ( 4 ) The influence of soil physical and chemical properties for before and after burning ( flat ) .

林下植被生物量为：人促更新>天然更新>炼山人工造林。

The vegetation biomass under woods was artificial regeneration > natural regeneration > artificial afforestation .

不同林分物种丰富度为：天然更新>人促更新>炼山人工造林；

The species abundant degree in different stands was : natural regeneration > artificial regeneration > artificial afforestation ;

结果表明，炼山人工造林对林地植被和土壤有一定的破坏作用，是影响林木生长、导致物种丧失、引起林地水土流失和地力衰退的重要原因。

The results indicated that artificial forestation destroyed the forest vegetation and soil , resulting the species loss , soil and water loss and soil fertility decline , unfavorable for the forest growth .

方差分析结果表明，炼山对杉木造林存活率具有明显的提高效应；

This paper deals with the effect of controlled burning on the growth of5-year-old plantation of Chinese-fir by using variance analysis .

区内暴雨多与降雨侵蚀力R值大、炼山全垦整地造林以及不合理的开发建设活动，是造成土壤侵蚀加剧的主要原因。

In the region , more rainstorms , great R value of rainfall erosive agent , burning the grass on waste hills and conducting whole reclamation for soil preparation and afforestation and irrational activities of development and construction are the main reasons for intensifying soil erosion .