Abstract
Based upon 2 x 2 contingency table, chi2 test and association coefficient were used to determine the interspecific association between understory species in a southern highland plantation, and to analyze the restoration degree and the stability of southern highland vegetations originated from plantation. The Qianyanzhou in Taihe County of Jiangxi Province, a typical sample of southern highland plantation, was chosen to make the study. The results showed that both in shrub layer and in herb layer, species pair with chi2 reaching significant level (P <0.05) was few in number. In shrub layer, 12 species pairs' association was highly significant (P < 0.01), 19 pairs' was significant (P < 0.05), and other 200 pairs' was nonsignificant, while in herb layer, 11 pairs' was highly significant, 11 pairs' was significant and other 83 pairs' was nonsignificant. According to interspecific association and correlation, shrub layer was divided into two species groups: Group I . Adinandra bockiana, Syzygiumn grijsii, Vaccinium bracteatunm, Ilex aculeolata, Smilax ferox, Eurya muricata and Group II . Lespedeza davidii, Serissa serissoides, Vitex negundo var. cannabifolia. Many species in Group I had a significantly negative association with the species in Group II, and dominant species always played a key role in the relationships among species. The three dominant species in herb layer, Wooduardia japonica, Dryopteris atrata and Adiantun flabellulaturn, had a highly significant positive correlation between each other, and moreover, had a significant or highly significant positive association with many other herbaceous species. Similarily, dominant species in shrub layer played a key role on the interspecific association in the two species groups. The ratios of positive and negative association indicating the species compositions of the two layers were fluctuating, which was 125/106 in shrub layer and 42/63 in herb layer. Several shortcomings of interspecific association method were pointed out, with some proposals put forward.
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Claims 14
Claim · model-written summary
Few species pairs in either shrub or herb layer reached significant chi-square association.
Verbatim
e0“both in shrub layer and in herb layer, species pair with chi2 reaching significant level (P <0.05) was few in number”
Claim · model-written summary
In the shrub layer, 12 pairs had highly significant association.
Verbatim
e0“In shrub layer, 12 species pairs' association was highly significant (P < 0.01)”
Claim · model-written summary
In the shrub layer, 19 pairs had significant association.
Verbatim
e0“19 pairs' was significant (P < 0.05)”
t0“understory species”
Claim · model-written summary
In the shrub layer, 200 pairs had nonsignificant association.
Verbatim
e0“other 200 pairs' was nonsignificant”
t0“understory species”
Claim · model-written summary
In the herb layer, 11 pairs had highly significant association.
Verbatim
e0“in herb layer, 11 pairs' was highly significant”
t0“understory species”
Claim · model-written summary
In the herb layer, 11 pairs had significant association.
Verbatim
e0“11 pairs' was significant and other 83 pairs' was nonsignificant”
t0“understory species”
Claim · model-written summary
In the herb layer, 83 pairs had nonsignificant association.
Verbatim
e0“other 83 pairs' was nonsignificant”
t0“understory species”
Claim · model-written summary
Shrub species were divided into two groups by association and correlation.
- Taxon
- Adinandra bockianaAdinandra bockianae0
- Outcome
- two species groupse0
- Setting
- shrub layere0
Verbatim
e0“shrub layer was divided into two species groups: Group I . Adinandra bockiana, Syzygiumn grijsii, Vaccinium bracteatunm, Ilex aculeolata, Smilax ferox, Eurya muricata and Group II . Lespedeza davidii, Serissa serissoides, Vitex negundo var. cannabifolia”
Claim · model-written summary
Many species in shrub group I were negatively associated with species in group II.
Verbatim
e0“Many species in Group I had a significantly negative association with the species in Group II”
Claim · model-written summary
Dominant shrub species played a key role in interspecific relationships.
Verbatim
e0“dominant species always played a key role in the relationships among species”
Claim · model-written summary
The three dominant herb species had highly significant positive correlations with each other.
Verbatim
e0“Wooduardia japonica, Dryopteris atrata and Adiantun flabellulaturn, had a highly significant positive correlation between each other”
Claim · model-written summary
The dominant herb species had significant or highly significant positive associations with many other herbaceous species.
Verbatim
e0“The three dominant species in herb layer, Wooduardia japonica, Dryopteris atrata and Adiantun flabellulaturn, had a highly significant positive correlation between each other, and moreover, had a significant or highly significant positive association with many other herbaceous species”
t0“understory species”
Claim · model-written summary
The shrub layer had a positive to negative association ratio of 125/106.
Verbatim
e0“125/106 in shrub layer”
t0“understory species”
Claim · model-written summary
The herb layer had a positive to negative association ratio of 42/63.
Verbatim
e0“42/63 in herb layer”
t0“understory species”