新疆杨生物量空间分布特征研究

Characteristics of Spatial Distribution of the Biomass of Populus alba var pyramidalis Bge

【目的】为准确评估新疆杨碳储量提供科学依据。【方法】在阿克苏扎木台试验林场选取新疆主要造林树种新疆杨人工林为研究对象,采用样地实测法,在幼龄、中龄、成熟3个龄级样地内选取6株新疆杨标准木进行树干解析,并分析不同土壤深度中各径级根系生物量与林龄的关系。【结果】新疆杨人工林林分平均生物量为106.6 t/hm2,地上部分占84.8%,地下部分占15.2%,随着林龄的增加,树干、地上生物量及林分总生物量均显著增加,地上生物量分配比例基本保持树干>树枝>树皮>树叶这一规律,其中树干生物量占据地上生物量的主导地位(占55.2%);地下根系主要集中分布在0～40 cm土层,其生物量约占根系总生物量的80%以上。【结论】新疆杨林分生物量与林龄密切相关,随着林龄的增大,林分生物量也增大。

[ Objective ] In order to supply scientific base for accurately assessing carbon storage of artificial Populus alba vat pyramidcdis Bge. [ Method ] In Zamutai experimental forest of Aksu city, artificial Populus alba var pyramidalis Bge forest was selected as study object in this paper. Two standard trees were chosen respectively from typical young, middle and mature forests to study the relationship between forest age and root - biomass with individual diameter root class in different soil layers. [ Result ] The results showed that the average biomass of artificial Populus alba var pyramidalis Bge forest was 106.6 t/hm2. Among them, aboveground biomass and underground biomass occupied about 84. 8% and 15.2% , respectively. Total biomass, aboveground biomass and stem biomass all dramatically increased with increasing of forest ages. The distribution ratio of aboveground biomass among individual organs of artificial Populus alba var pyramidalis Bge was： stem 〉 branch 〉 bark 〉 leaf. And the stem biomass occupy the leading position of biomass （about 55.2% ）. Root biomass are mainly disturbed in 0 -40 cm soil layers,which occupied more than 80% of total root biomass. [ Conclusion]The relationship between stand biomass of artificial Populus alba var pyramidalisBge and stand age is close. With increase of stand age, the biomass increased.