斯蒂芬森先生称，现在美国西部的夏季变得更长了，天气变得更热了。这使得树木的生命更脆弱，削弱了树木逃脱虫害和火灾的能力。
Mister Stephenson says summers are becoming longer and hotter in the western United States. This makes trees weaker and decreases their ability to survive insect attacks and forest fires.
这就意味着无论何种树木，即便是在遭遇极端气候灾害或者虫害的情况下，都至少有部分个体对灾害有抵抗能力。
That means that for most threatening conditions, for climate, insects, and pests, whatever, there will be at least some individual trees of any given species tree that are resistant.
此外，林地内的土壤元素含量在病害侵入前后也会发生一定的变化：受到轻度砍伐的林地内其P、K含量较高，有利于提高树木对病虫害的抵抗能力。
Furthermore, proportion of total N, available P, available K in soil are dissimilar after the disease invaded: Capacities of resistance on disease will be enhanced if infect trees are cut appropriate.
结果表明：土壤物理、化学、生物学性质的恶化是长春市街路树木病虫害严重发生的主要原因。
Result shows that the main reason for serious occurrence of pest and disease on street afforestation trees is the deteriorating of the physic-chemical and biological properties of soil.
本发明属于树木病虫害防治技术领域，特别涉及一种用于树木杀虫杀菌的胶囊。
The invention relates to a capsule for tree disinfestation and sterilization, belonging to the technical field of tree pest control.
因为它是酸值很高，树木获得来自土壤的养分就会减少，森林也变得更容易受到干旱和病虫害袭击。
Trees receive fewer nutrients from the earth because it is so acid, and this creates forests that are more vulnerable to drought, disease and insect attack.
因为它是酸值很高，树木获得来自土壤的养分就会减少，森林也变得更容易受到干旱和病虫害袭击。
Trees receive fewer nutrients from the earth because it is so acid, and this creates forests that are more vulnerable to drought, disease and insect attack.
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