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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (10): 85-92.doi: 10.11707/j.1001-7488.20151011

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Analysis of Inter-Specific Correlation of Cephalcia kunyushanica and Tree Layer Plant Species in Natural Forests in Kunyushan

Pan Qi1, Liang Jun1,2,3, Ni Yang1, Yuan Xiaowen3,4, Shi Liang3,4, Li Jianwei3,4, Zhang Xingyao1,2,3   

  1. 1. Key Laboratory of Forest Protection of China State Forestry Administration Research Institute of Forest Ecology, Environment and Protection, CAF Beijing 100091;
    2. Co-Innovation Center for Sustainable Forestry in Southern China Nanjing 210037;
    3. Kunyushan Forest Ecosystem Research Station Yantai 264100;
    4. Kunyushan Forest Farm of Shandong Province Yantai 264100
  • Received:2014-08-24 Revised:2015-01-13 Online:2015-10-25 Published:2015-11-10

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Abstract: [Objective] Inter-specific association is a kind of measurement which depicts the spatial coexisting patterns of one species pair or many different species in a certain space region,and it is a statistical judgement method based on binary qualitative analysis. [Method] Based on Square-Plot method and the 2×2 contingency table of species presence/absence data collected from 50 permanent plots in Kunyushan region, the VR analysis, 2-test, association coefficient, Ochiai association index, Dice association index, point correlation coefficient, Cramer index, as well as percentage co-occurrence, were used in quantitative analysis of the inter-specific correlation of Kunyushan web-spinning sawfly (Cephalcia kunyushanica, the defoliator) occurrence and adjacent Tree layer plants of natural forests in Kunyushan region, and the importance values of those plants were also evaluated. [Result] Seven species, including Pinus densiflora, P. thunbergii, P. koraiensis, P. armandii,P. taeda, P. banksiana and P. resinosa, were found to be the host of C. kunyushanica, and the summation of the importance values of the seven plants accounted for 49.1% of the total importance values of all tree species. The results also indicated that there was a significant positive correlation of overall association existing among C. kunyushanica and other 57 neighboring tree species (P<0.01). The result of 2-test showed positive associations for 26 species-pairs and negative associations for 31 species-pairs, and the ratio of negative pairs was higher than positive ones. Furthermore, the insect showed extremely significant positive inter-specific correlation with P. densiflora (P<0.01) and P. thunbergii (P<0.05) respectively, while negative ones were found between the insects and Hovenia acerba (P<0.01) and Rhus chinensis (P<0.05), respectively.[Conclusion] According to the statistical results, we selected the four plant species mentioned above as the key species, using as future judging species of C. kunyushanica. Moreover, we discussed the reasons of spatial coexisting patterns of the specific insect herbivores-hosts-non-hosts model, and evaluated the application of each index. Given that C. kunyushanica, the specific insect herbivores, occurs only in Kunyushan region, the research would have indication to reveal the long time interaction and synergism evolution between the specialist pest and hosts.

Key words: Cephalcia kunyushanica, tree layer plants, inter-specific correlation

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