添加城市排水污泥对竹柳和欧美107杨嫩枝扦插苗生长及养分积累的影响  

Effects of urban sewage sludge additive on growth and nutrient accumulation in Salix americana and Populus×euramericana cv.‘74/76’softwood cuttings

作　　者：唐胶 彭祚登[1] 贾清棋 熊建军[2] 刘春和 冯天爽 王海东 Tang Jiao;Peng Zuodeng;Jia Qingqi;Xiong Jianjun;Liu Chunhe;Feng Tianshuang;Wang Haidong(Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Beijing 100083,China;Beijing City Drainage Refco Group Ltd,Beijing 100044,China;Huangfa Nursery,Beijing 102602,China)

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]北京城市排水集团有限责任公司,北京100044 [3]北京市黄垡苗圃,北京102602

出　　处：《北京林业大学学报》2020年第10期84-95,共12页Journal of Beijing Forestry University

基　　金：国家发改委环境污染第三方治理“北京市污泥资源化苗圃种植项目”:北京排水集团污泥资源化苗圃种植项目(2017HXFWLXY023)。

摘　　要：【目的】为明确城市排水污泥作为有机土壤改良剂在苗圃扦插育苗过程中的应用潜力,研究不同污泥施用量对竹柳和欧美107杨嫩枝扦插苗生长及养分积累的影响。【方法】在平原沙地苗圃中,以竹柳和欧美107杨当年生半木质化嫩枝条为试验对象,采用完全随机区组试验设计,设置3 kg/m2(T1)、6 kg/m2(T2)和9 kg/m2(T3)3个污泥施用量梯度,以不施污泥为对照(CK),在扦插前测定各处理土壤密度和孔隙度,在扦插后35 d统计各处理扦插苗成活株数,在扦插后35、50、65、80 d观测各处理扦插苗新梢长度和新梢基径的变化,并在生长末期进行取样,测定各处理扦插苗生物量参数、根系各形态参数以及叶片养分含量。【结果】不同污泥施用量均能够降低土壤密度、增大土壤孔隙度。对于竹柳而言,随着污泥施用量的增加,不同测试时间其扦插苗新梢长度均呈现先上升后下降再上升的变化趋势,T1处理对其新梢生长的促进作用最明显,显著高于CK;T1处理下竹柳扦插苗生物量参数、根系各形态参数、叶片全碳(C)含量和碳氮比(C/N)均高于CK,并达到显著水平;不同处理间竹柳扦插苗成活率没有明显差异。对于欧美107杨而言,T3处理能够显著提高其扦插苗成活率以及根系生物量参数;随着污泥施用量的增加,其扦插苗的新梢长度、根表面积、根体积、平均根系直径均呈现先增加后减小的变化趋势,且均在T2处理达到最大值;其扦插苗叶片C、全氮(N)含量和C/N在施用污泥后均有所增加,以T3处理效果最佳。生物量参数和根系形态参数关系密切,总生物量与地上、根系生物量均呈极显著正相关关系,这三者与总根长、根表面积、根体积、平均根系直径亦分别表现为极显著正相关关系。【结论】城市排水污泥的适量施用,有利于两树种嫩枝扦插苗的生长及其叶片对部分养分元素的吸收,其中3 kg/m2污泥施用量�[Objective]In order to clarify the application effect of urban sewage sludge as an organic soil amendment on cuttings during the nursery culture,growth and nutrient accumulation in Salix americana and Populus×euramericana cv.‘74/76’softwood cuttings were studied at different sludge application rates.[Method]In the nursery with sand land of plain area,the same aged semi-lignified branches of Salix americana and Populus×euramericana cv.‘74/76’were used as materials in a completely random block design at application doses of 3 kg/m2(T1),6 kg/m2(T2)and 9 kg/m2(T3),and an untreated control(CK).Soil properties including soil bulk density and porosity were measured in advance.Survival rate in every treatment was counted at 35 days after cutting.The new shoot length and diameter of each treatment were measured at 35,50,65 and 80 days after cutting.Samples were sampled at the end to determine parameters in biomass,root morphology,and nutrient content.[Result]Sludge application reduced soil bulk density and increased soil porosity.For Salix americana,with the increase of sludge application,the new shoot length showed an increasing trend at the start,followed by decreasing,and then increased again.The T1 treatment promoted the growth of Salix americana cuttings’new shoots that had the most obvious promotion effect,which was significantly higher than the control.The biomass parameters,root morphological parameters,leaf carbon(C)content and carbon to nitrogen ratio(C/N)of Salix americana cuttings in the T1 treatment were also significantly higher than those in the control.Different treatments had no significant effect on the survival rate of Salix americana cuttings.For Populus×euramericana cv.‘74/76’,the T3 treatment could significantly increase the survival rate and root biomass parameters of cuttings.With the increase of sludge application,the new shoot length,root surface area,root volume,and average root diameter of Populus×euramericana cv.‘74/76’cuttings first increased and then decreased,and both

关 键 词：城市排水污泥 竹柳 欧美107杨 嫩枝扦插 生长 养分积累 

分 类 号：S723.132.1[农业科学—林木遗传育种]