摘要:
采用样方收获法对人工多年生草果园草被残体的量进行测定,并进行果园草被残体原位分解试验。结果表明:4种草被(圆叶决明、百喜草、宽叶雀稗、日本草)的样方残体量分别为406.00、1 582.28、1 542.62、658.07 g,分别占其样方地上部物质总量的33.8%、76.1%、59.4%、100.0%;百喜草、圆叶决明、日本草草被残体半腐解时间为5个月,而宽叶雀稗为6个月;4种草被残体年释放量为残体氮素贮量的90.86%、67.76%、88.45%、88.33%,折合果园氮素年释放81.16、119.02、219.68、58.71 kg·hm-2;4种草被残体磷素年释放量分别为残体贮量的84.46%、80.32%、90.90%、87.22%,折合磷素年释放量为167.69、534.96、604.49、343.22 kg·hm-2。
关键词:
-
果园生草 /
-
残体 /
-
氮 /
-
磷 /
-
分解
Abstract:
Grass residues and decomposition of nitrogen and phosphorus in grassing orchards were studied by using the harvest quadrat method. The residues of the 4 grasses, Chamaecrista rotundifolia,Paspalum natatum, Paspalum wetsfeteinii and Borreria latisolia, were 406.00, 1 582.28, 1 542.62 and 658.07 g, respectively, accounting for 33.8%, 76.1%, 59.4%, and 100.0% of the total, respectively. The half-decomposition time of the grass residues was 5 months for P. natatum, C. rotundifolia and B.latisolia, while 6 months for P.wetsfeteini. The nitrogen storage of the annual losses of the 4 grass residues were 90.86%, 67.76%, 88.45% and 88.33%, respectively, which equated the annual losses of orchard nitrogen of 81.16, 119.02, 219.68 and 58.71 kg穐m-2, respectively. These were far less than 864 kg穐m-2.The phosphorus storage of the annual losses of the 4 grass residues were 84.46%, 80.32%, 90.90% and 87.22%, respectively, which equated the annual losses of orchard phosphorus of 167.69, 534.96, 604.49 and 343.22 kg穐m-2, respectively. These were less than the amount of adsorbable phosphorus in the cultivated soil.
点击查看大图
下载:
