施用沼液对杨树人工林凋落物量与林木生长的影响  

作　　者：徐涵湄 薛斌 查全智 曹国华 沈彩芹 

机构地区：[1]南京林业大学生物与环境学院,南京210037 [2]江苏省东台市林场,江苏东台224200

出　　处：《智慧农业导刊》2022年第22期29-33,共5页JOURNAL OF SMART AGRICULTURE

基　　金：江苏省林业局林业科技创新与推广项目(LYKJ[2022]01,LYKJ[2022]16);江苏林业局造林项目(SJB2022G0001)。

摘　　要：沼液已成为人工林可持续经营管理过程中的优质有机肥料。研究长期施用不同沼液浓度作用后,对杨树人工林凋落物量和林木生长的影响,为杨树人工林经营和沼液科学合理利用提供理论依据。连续6年对江苏盐城东台林场10年生杨树人工林进行不同沼液浓度施用试验(包括对照(CK)、低浓度(L,125 m^(3)/ha·yr)、中浓度(M,250 m^(3)/ha·yr)、高浓度(H,375 m^(3)/ha·yr)),研究不同浓度施肥处理对杨树人工林林分凋落物和树高、胸径和冠幅的生长影响,以及林下植被多样性的变化。杨树人工林的年凋落物量在不同沼液浓度处理下的变化为L>M>H>CK,L、M沼液浓度处理下的杨树人工林凋落物量要显著高于CK、H处理;凋落叶氮含量在L、M沼液浓度处理下极显著高于对照CK和H沼液浓度处理,凋落叶磷含量在M沼液浓度处理下显著高于其他3种沼液浓度处理;L、M、H沼液浓度处理下林木的树高显著高于CK样地林木树高,并且L、M沼液浓度处理下的林木树高增长显著快于H处理;草本植物多样性在CK处理下显著高于3种沼液浓度处理,分别比L、M、H沼液浓度处理高28.1%、21.9%、18.8%。施用适当中低浓度的沼液可以更显著提高杨树的生长量,进而提高杨树地上部分的生产力;同时,中低浓度沼液可以增加凋落物中养分元素的含量,也有利于促进草本优势种的生长。Biogas slurry has become a high quality organic fertilizer in the sustainable management of plantation.To study the effects of long-term application of different biogas slurry concentrations on litter amount and tree growth in poplar plantation,so as to provide theoretical basis for poplar plantation management and scientific and rational utilization of biogas slurry.Different biogas slurry concentrations(including control(CK),low concentration(L,125 m^(3)/ha·yr),medium concentration(M,250 m^(3)/ha·yr)and high concentration(H,375 m^(3)/ha·yr)),were applied to the 10-year-old poplar plantation in Dongtai Forest Farm,Yancheng,Jiangsu Province for six consecutive years.To study the effects of different fertilization concentrations on litter growth,tree height,DBH,crown width,and understory vegetation diversity in poplar plantation.The annual litter amount of poplar plantation varied as L>M>H>CK under different biogas slurry concentrations.The litter amount of poplar plantation under L and M biogas slurry concentrations was significantly higher than that under CK and H treatments;The nitrogen content of litter under L and M biogas slurry concentration treatments was significantly higher than that under CK and H biogas slurry concentration treatments,and the phosphorus content of litter under M biogas slurry concentration treatment was significantly higher than that under the other three biogas slurry concentration treatments;The tree height of trees under the biogas slurry concentration treatment of L,M and H was significantly higher than that of the CK plot,and the tree height growth under the biogas slurry concentration treatment of L and M was significantly faster than that under the H treatment;The herb diversity under CK treatment was significantly higher than that under the three biogas slurry concentration treatments,which were 28.1%,21.9%and 18.8%higher than those under L,M and H biogas slurry concentration treatments,respectively.Application of appropriate medium and low concentration biogas slurry can si

关 键 词：沼液 凋落物量 林木生长 草本植物多样性 杨树 

分 类 号：S792.11[农业科学—林木遗传育种]