摘要
本文研究了鄂尔多斯草地荒漠化过程与植被生物最变迁的关系。结果表明 :在鄂尔多斯草地荒漠化过程中 ,植物群落退化的趋势为本氏针茅群落→本氏针茅 +油蒿群落→油蒿群落→沙地以及油蒿群落→油蒿 +牛心朴子群落→牛心朴子群落→沙地。从本氏针茅群落→油蒿群落→牛心朴子群落植被退化的过程中 ,植被生物量表现为先增后降的过程 ,为 2 1 8 1→ 74 8 7→ 1 55 6g m2 。随着季节的变化 ,由于优势种和伴生种的消长不同 ,各阶段的植被生物量的变化不一致。地上生物量大部分集中在表层 ,在 0～ 2 0cm占 76 9%～86 3% ;随着高度的增加 ,植被生物量剧减 ,其中 1 0 8%～ 1 6 7%在 2 0～ 30cm ,2 2 %～ 7 5%在 30～ 4 0cm ,0 6%～ 2 9%在 4 0cm以上。地下生物量 85 5%～ 1 0 0 %在 0～ 2 0cm ;9 7%～ 1 2 0 %在 2 0～ 4 0cm ,0～ 2 5%在4 0cm以下。在植被生物量的累积过程中 ,本氏针茅群落和本氏针茅 +枯油蒿群落处于先消耗后累积状态 ,累积率分别为 -0 2 9～ 0 4 2和 -0 4 7～ 0 74 ;本氏针茅 +油蒿群落和油蒿群落生物量一直处于消耗状态 ,累积率为 -0 0 4～ -0 4 0和 -0 2 3;油蒿 +牛心朴子群落和牛心朴子群落生物量一直处于增长状态 ,累积率为 0 1 4～ 0 2 9和 0 52～ 0 0 4。
The correlation between the desertification of the grassland and the change of vegetation biomass in Erduosi was reported in this paper. The results showed that, in the desertification course of the grassland, the degradation pathway of the community was both from \%S. bungeana\% community→\%S.bungeana\%+died \%Artemisia ordosia\% community→\%S.bungeana+A.ordosica\% community→\%Stipa bungeana\% community→sandland and from \%A.ordosica\% community→\%A.ordosica+Cynanchum komarovii\% commmunity→\%C.komarovii\% commmunity→sandland. From \%S. bungeana\% community to \%A.ordosica\% community and then to \%C.komarovii\% commmunity, the biomass of vegetation increased firstly and then decreased, namely from 218\^1?g/m\+2 to 748\^7?gm\+2 and to 155\^6?g/m\+2. The biomass of every community varied seasonally, because of the changes of dominant species and companion species. Most of the biomass aboveground distributed near the surface layer, 76\^9%～86\^3% of the biomass in 0～20?cm. Meanwhile, the biomass decreased gradually with the increasing of height, 10\^8%～16\^7% of the biomass in the 20～30?cm layer, 2\^2%～7\^5% in 30～40?cm layer, 0\^6%～2\^9% above 40?cm. The underground, 85\^5%～100% of the biomass in 0～20?cm, 9\^7%～12\^0% in 20～40?cm, 0～2\^5% in under 40?cm. In the course of biomass accumulation, \%S. bungeana\% community and \%S.bungeana\%+died \%A.ordosia\% community decreased firstly and then increased, the accumulation ratio is from -0\^29 to 0\^42 and from -0\^47 to 0\^74, respectively. \%S.bungeana+A.ordosica\% community and \%S. bungeana\% community decreased steadily, the accumulation ratio is from -0\^04 to -0\^40 and -0\^23, respectively. But \%A.ordosica+C.komarovii\% commmunity and \%C.komarovii\% commmunity increased steadily, the accumulation ratio is, respectively, from 0\^14 to 0\^29 and from 0\^52 to 0\^04.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2001年第2期13-20,共8页
Scientia Silvae Sinicae
基金
国家自然科学基金重大项目!(39990 490 )的部分内容
