摘要
采用凋落物分解袋野外埋置法,对平朔露天煤矿复垦区刺槐油松混交林凋落物分解过程及其养分动态进行了分析。结果表明,凋落叶年分解速率表现为刺槐(51.27%)>混合(39.48%)>油松(29.05%);由Olson模型拟合的年分解系数表现为刺槐(0.71)>混合(0.46)>油松(0.33);分解50%和95%所需时间均表现为油松>混合>刺槐;各类型凋落叶分解95%所需时间约为分解50%所需时间的4倍;在1 a的分解过程中,各类型凋落叶的C,K均表现为直接释放模式,刺槐的N和P表现为富集模式,油松的N和P表现为淋溶—富集—释放模式,混合叶的N表现为富集模式,P表现为淋溶—富集模式。刺槐和油松凋落叶的混合分解较油松凋落叶单独分解表现出明显的促进作用。
By burying the field little fall decomposition bags,the paper analyzed the decomposition process and nutrient dynamic of litter fall in Robinia pseudoacacia×Pinus taebelaefolius mixed forest in reclamation region in Pingshuo opencast coal mine.The results showed that the annual decomposition rate was in the order： Robinia pseudoacacia（51.27%）mixed（39.48%）Pinus taebelaefolius（29.05%）.The decomposition coefficient fitting by Olson＇s model,was in the order： Robinia pseudoacacia（0.71）mixed（0.46）Pinus taebelaefolius（0.33）,the time of decomposition 50%（t0.5）and 95%（t0.95）were in the order： Pinus taebelaefoliusmixedRobinia pseudoacacia,t0.5 was about four times the size of t0.95.In one year decomposition period,C and K appeared to release immediateness.N and P appeared to enrichment in Robinia pseudoacacia,leaching-enrichment-release in Pinus taebelaefolius.In the mixed,N appeared to enrichment,P appeared to leaching-enrichment.The mixed decomposition of Robinia pseudoacacia and Pinus taebelaefolius showed obvious promotion compared with the individually decomposition of Pinus taebelaefolius.
出处
《山西农业科学》
2017年第11期1810-1813,共4页
Journal of Shanxi Agricultural Sciences
基金
国家"十二五"科技支撑计划课题(2012BAC10B04)
山西省科技重大专项(20121101007)
山西省青年科技研究基金项目(2013021030-4)
关键词
平朔露天煤矿
复垦区
刺槐油松混交林
凋落物
分解速率
养分动态
Pingshuo opencast coal mine
reclamation region
Robinia pseudoacacia
Pirtas taebelaefolius mixed forest
litter
decomposition rate
nutrient dynamic
