不同生态景观条件下滨海沙地木麻黄人工林抗虫害性能研究

Study on the Anti-pest Function of Casuarinaeguisetfolia Ecosystem With Different Eco-Landscapes in Coastal Sandy

通过对不同生态景观条件下滨海沙地木麻黄人工林抗虫害调查,发现木麻黄对星天牛的抗害率随着林龄导致的生态景观异质性条件改变而变化,总体趋势是随着林龄的增大而增强,其中1年生木麻黄的抗害率最高,为97.46%,3年生木麻黄的抗害率最低,只有55.78%。木麻黄前沿基干林抗害率为90.15%,比相同林龄的后沿林抗害率(79.80%)高,有廊道隔开的后沿林比集中连片的木麻黄纯林抗虫率高出16.65个百分点。在相似程度的生境破碎化条件下,同林龄(3年生)的木麻黄人工林,栽植前细致整地并炼过地的抗害率达84.28%,而栽植前不采取炼地和细致整地的抗害率仅为55.78%。相似生境条件下,林下无凋落物、凋落物层薄、凋落物层较厚的3种木麻黄人工林抗害率分别为77.0%、73.5%、67.0%。

It was studied the anti - pest function of Casuarinaeguisetfolia ecosystem with different ecological landscapes coastal sandy, the results showed that there were significant differences of anti - pest function of Casuarinaeguisetfolia ecsystem among landscape heterogeneity with different ages, with the overall trends of increase followed the increase in ageOf which, the casuarina plantation with 1 year old has the highest anti - pest rate, accounting for 97.46% , while casuarinplantation with 3 years old has the lowest anti - pest rate, accounting for 55.78%. The anti - pest ratio was 90.15% in thcutting - edge backbone forest belt, but was 79.80% in the trailing - edge forest with the same ages. The anti - pest rate the trailing - edge forest with corridors is 16.65% higher than that centralized pure forest. Under the similar habitat framentation conditions, the anti - pest rate was 84. 28% in the 3 years-old Casuarinaeguisetfolia plantation which land wprepared before plantation, but was 55.78% in the none - prepared lands Casuarinaeguisetfolia plantation. Under the simlar habitat conditions, the anti - pest rate among forest stand with none - litter, thin layer litter, thicker layer litter w77. 0% , 73. 5% , and 67. 0% , respectively.