摘要
为了分析薛家庄林场樟子松人工林不同林龄光合特性及林下土壤状况,本研究在山西省杨树林局薜家庄林场樟子松人工林基地进行实验,依据不同林龄分为不同处理,试验Ⅰ(5 a<林龄<10 a)、试验Ⅱ(10≤林龄<15 a)、试验Ⅲ(15≤林龄<20 a),对比分析不同林龄下的光合特性及林下土壤情况。结果可知,试验Ⅱ处理的光合速率蒸腾速率、气孔导度高于其他处理,胞间CO_(2)浓度低于其他处理;三个林龄阶段的樟子松人工林叶绿色SPAD值分别是0.65 mg/g、0.66 mg/g和0.66 mg/g,随着林龄变化呈波动趋势,但变幅小;试验Ⅱ处理的土壤容重最低,土壤孔隙度和土壤有机质含量最高;试验Ⅱ处理的樟子松林地土壤速效钾、速效磷、碱解氮高于其他处理;由此可知,樟子松人工林不同林龄阶段其光合特性及林下土壤状况存在差异,10≤林龄<15a阶段的樟子松生长速度快,光合特性更明显,林下土壤理化性质较佳,土壤养分含量充足,为樟子松生长提供良好的帮助。因此在樟子松人工林生长阶段需补充土壤养分含量,增强樟子松光合能力,延缓植株衰退,促进其生长。
In order to analyze the photosynthetic characteristics and understory soil status of Pinus camphor plantation at different ages in Xujiazhuang Forest Farm,this study was carried out in the plantation base of Xujiazhuang Forest Farm,Poplar Forest Bureau,Shanxi Province,and divided into different treatments according to different ages.ExperimentⅠ(5a<age<10a),ExperimentⅡ(10≤age<15a)and experimentⅢ(15≤age<20a)were used to compare and analyze the photosynthetic characteristics and soil conditions under different forest ages.The results showed that the photosynthetic rate,transpiration rate and stomatal conductance of testⅡtreatment were higher than those of other treatments,and the intercellular CO_(2) concentration was lower than that of other treatments.The green SPAD values of the leaves of the three age stages were 0.65mg/g,0.66mg/g and 0.66mg/g,respectively,which showed a fluctuation trend with the change of age,but the variation amplitude was small.The soil bulk density under testⅡwas the lowest,and the soil porosity and soil organic matter content were the highest.The soil available potassium,available phosphorus and alkali-hydrolyzed nitrogen treated by experimentⅡwere higher than those treated by other treatments.It can be concluded that there are differences in the photosynthetic characteristics and soil conditions of P.camphor plantation at different age stages.The growth rate of P.camphor plantation at 10≤age<15a is faster,the photosynthetic characteristics are more obvious,the physical and chemical properties of the soil under the forest are better,and the soil nutrient content is sufficient,which provides good help for the growth of P.camphor.Therefore,it is necessary to supplement the soil nutrient content,enhance the photosynthetic capacity,delay the plant decline and promote the growth of P.camphor plantation in the growth stage.
作者
何林
HE Lin(Shanxi Poplar forest Bureau Xujiazhuang forest farm,Shuo Zhou 036002,Shanxi,China)
出处
《林业科技情报》
2025年第3期159-162,共4页
Forestry Science and Technology Information
关键词
樟子松人工林
光合特性
林下土壤
理化性质
养分指标
Pinus camphor plantation
photosynthetic characteristics
understory soil
physical and chemical properties
nutrient index
