卷荚相思林分凋落物产量与林分生长相关性研究——林地自肥能力与森林生产力相关性研究
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摘要
文章通过对卷荚相思试验林凋落物产量的收集与分析,试验林每年生长量的测定与计算,综合分析表明:①2～5a卷荚相思试验林在2003～2005年3a中,回归林地的凋落物产量为12208 kg/hm2,平均每月回归1017kg/hm2。②以整年计,3～5a生卷荚相思林分全年凋落物(枯叶)产量最高月份都出现在10月份,最低月份都出现在3月份。2003年最高月份凋落物产量为1411 kg/hm2,最低凋落物产量为16kg/hm2,全年平均每月凋落物产量为374kg/hm2。2004年最高月份凋落物产量为1216kg/hm2,最低凋落物产量为8kg/hm2,全年平均每月凋落物产量为320.7kg/hm2。2005年最高月份凋落物产量为647.8 kg/hm2,最低凋落物产量为56 kg/hm2,全年平均每月凋落物产量为322.6kg/hm2。而且,随着林龄的增加,凋落物最多的月份的凋落物产量也越来越少。③凋落物年度总产量与林分树高生长量以及胸径生长量相关性:随着林龄的增长,树高、胸径生长由快变慢,而每年每增加1m树高以及1cm胸径所需要的凋落物却是越来越多。④凋落物年度总产量与林分材积生长量相关性:随着林龄的增长,材积生长由快变慢,而每年每增加1m3所需要凋落物产量的是越来越少。从中可以知道凋落物产量的升降虽然对材积有影响,但影响不大。
In the paper,the annual growth productions of Acacia concinnata test plantation were measured and calculated,with the collection and analyses of its litter.The result showed that :①The litter productions of 2～5 years old Acacia concinnata regressed to the land were 12208 kg/hm2 in the 2003～2005,and there were averagely 1017 kg/hm2 litter productions regressing to the land every month.②For the whole year,the highest annual litter production(the leaves) of Acacia concinnata stand in 3 years old,4 years old and 5 years old were all in October,the lowest ones were all in march.In 2003,the highest mensal litter production was 1411 kg/hm2,and the lowest was 16 kg/hm2.The average mensal litter production was 374 kg/hm2.In 2004,the highest mensal litter production was 1216 kg/hm2,and the lowest was 8 kg/hm2.The average mensal litter production was 320.7 kg/hm2.In 2005,the highest mensal litter production was 647.8 kg/hm2,and the lowest was 56 kg/hm2.The average mensal litter production was 322.6 kg/hm2.And the larger stand age,the more mensal litter production which month the highest mensal litter production was in.③The annual litter production was connected with the growth of the stand height and DHB.The larger stand age,the lower growth of the stand height and DHB.And increasing 1m with height and 1cm with DHB,the annual litter production needed was more and more.④The annual litter production was connected with the growth of the stand volume.The larger stand age,the lower growth of the stand volume.And increasing 1m3 with volume,the annual litter production needed was less and less.The annual litter production affected the volume,but it had little effect.
In the paper,the annual growth productions of Acacia concinnata test plantation were measured and calculated,with the collection and analyses of its litter.The result showed that :①The litter productions of 2～5 years old Acacia concinnata regressed to the land were 12208 kg/hm2 in the 2003～2005,and there were averagely 1017 kg/hm2 litter productions regressing to the land every month.②For the whole year,the highest annual litter production(the leaves) of Acacia concinnata stand in 3 years old,4 years old and 5 years old were all in October,the lowest ones were all in march.In 2003,the highest mensal litter production was 1411 kg/hm2,and the lowest was 16 kg/hm2.The average mensal litter production was 374 kg/hm2.In 2004,the highest mensal litter production was 1216 kg/hm2,and the lowest was 8 kg/hm2.The average mensal litter production was 320.7 kg/hm2.In 2005,the highest mensal litter production was 647.8 kg/hm2,and the lowest was 56 kg/hm2.The average mensal litter production was 322.6 kg/hm2.And the larger stand age,the more mensal litter production which month the highest mensal litter production was in.③The annual litter production was connected with the growth of the stand height and DHB.The larger stand age,the lower growth of the stand height and DHB.And increasing 1m with height and 1cm with DHB,the annual litter production needed was more and more.④The annual litter production was connected with the growth of the stand volume.The larger stand age,the lower growth of the stand volume.And increasing 1m3 with volume,the annual litter production needed was less and less.The annual litter production affected the volume,but it had little effect.
引文
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[2]杨玉盛,何宗明,陈光水,等.不同生物治理措施对赤红壤抗蚀性影响的研究[J].土壤学报,1999,36(4):528-534.
[2]杨玉盛,何宗明,陈光水,等.不同生物治理措施对赤红壤抗蚀性影响的研究[J].土壤学报,1999,36(4):528-534.