关键词: 土壤昆虫, 施肥, 非度量多维标度分析, 主成分分析

Abstract: Grey desert soil was a representative of aridity and hungriness belt soil. 80% area of was distributed at Xinjiang. National grey desert soil fertility and fertilizer efficiency long-term monitor site，which built at 1990 was one of 9 National soil fertility and fertilizer efficiency long-term monitor site, its area was 468m2. There were 10 types of fertility treatment, namely abandonment （aband.）, no-fertilizer（CK）, nitrogen fertilizer（N）, nitrogen and phosphor fertilizer（NP）, nitrogen and potassium fertilizer（NK）,phosphor and potassium fertilizer（PK）,nitrogen and phosphor and potassium fertilizer（NPK）, NPK with organic matter（fertilizer N : organic N =3:7）（MNPK）,150% NPK with organic matter（1.5 MNPK）, NPK with straw(SNPK). The effect of different fertilizer treatments on soil insect community at the grey desert soil district in Xinjiang was investigated in Sept. 2004, 90 soil samples and 100 pitfall had been collected and 4915 soil insects（128 unknown） individuals, belonging to 9 Orders and 33 families were obtained by pitfall traps and modified Tullgren methods. The result showed that the number of individual and group, the macro fauna both reached their peaks in abandonment, while mesofauna and micro fauna in nitrogen fertilizer（N） and phosphor and potassium fertilizer（PK）respectively . Of the 10 treatments, most dominant of soil insect composition was in MNPK, most evenness of was nitrogen fertilizer（N）.The result by Kruskal- Wallis test indicated that the distribution of the crop soil insect was significantly impacted by different fertilizer treatments （X0.05（9）= 23.38，p < 0.005）,soil insect group of the abandoned was significantly different from that of others fertilizer treatments. The soil insect community were divided into five group by Non-matric Multi-Dimensional Scaling（NM-MDS）analysis: （1）NPK,MNPK,1.5MNPK and CK ,（2）NP and PK，（3）NK and N，（4）SNPK and（5）aband., indicated that distribution of soil insect was related to fertilizer character. In the principal component analysis ,two factors explained 87.455% of the total variation among 10 treatments, the factor one explained nitrogen fertilizer（N）and NPK with straw （SNPK）positively effected, while second factor explained the aband. positively affected on soil insect community, that showed the diversified fertilizer did not evenly effect on the soil insect community.

Key words: soil insect, fertilizer, Non-matric Multi-Dimentional Scaling（NM-MDS）, principal component analysis