摘要
五个银合欢品种K8、K28、K29、K67和K132的盆栽苗经人工气候箱冻害试验表明,-3℃时各品种未发生冻害现象,至-4℃时叶片冻萎而脱落,转入常温下茎梢可以恢复生长;-5℃时茎,根全冻死,皮层坏死。K28萎蔫系数,沙壤土为5.1％～5.3％,粘红壤土为5.6％～5.8％。pH值最适范围5.2～7.5,pH<5.0或>8.0时生长受阻。5年生各品种根瘤固氮酶活性分别为34.600、22.764、20.840、31.750和121.240μgN_2·gFw^(-1)·h^(-1)。生长季高度生长量分别为2.24、1.06、1.24、1.08和2.42cm·d^(-1),年平均生长量(高/朐径)分另11为2.0/1.4、1.9/1.3、1.6/1.4、1.6/1.4和1.9/1.2m·cm^(-1)。3年生人工林地上邯生物量分别达30.53、35.86、30.71、42.80和43.66t·ha^(-1),凋落物量分别为4.30、4.49、8.30、10.87和12.05t·ha^(-1)·a^(-1)。K28萌蘖条1年生物量达21.75t·ha^(-1)(丘陵旱地)和25.23t·ha^(-1)(池边湿地)。
The ecological characteristics of five varieties of Leucaena leucocephala were investigated, and the growth, above-ground biomass and litter-fall were also compared. The five varieties includsd K8, K28, K29, K67 and K132. The rasults shoved that frost-killing temperturs of each variety occared at -5℃. The optimum soil pH for their growth ranged from 5.2 to 7.5, the minimim wllting coefficient ranged from 5.1 to 5.8 % in pot experiment. The nitrogenase activity of 5-year-old trees of these varieties were 34.600, 22.764, 20.840, 31.750 and 181.240ugN2 gFw-1 h-1, respectivaly, and the increment reached 2.24, 106, 1.24, 1.08 and 2.42cm per day, respectively.
The above-groand biomass (dry weight) of 3-year-old forests of K8, K28,K29 and K37 were 30.53, 35.83, 30.71 and 42.80 ton ha-1(4444 plants/ ha) , respectivaly, and that of K132 was 43.56 ton ha- (6666 plants/ha) The annual littar-fall of five varieties stand were 4.30 4.49, 8.30, 10. 7 and 12.05 ton ha-1, respectively.The annual biomess of the sprout land of K28 was up to 21.75-25.23ton ha-1.
基金
福建省科学技术委员会
福建省水土保持委员会资助
关键词
银合欢
生物量
人工林
生态学
Leacaena leaaoaephzla, Nitrogenase activity, Frost-kit ling tetnpsrature, Blonies, Litter-fall
