The developmental duration and survival rate of egg, larva and pupa and adult longevity and fecundity of Diorhabda rybakowi were investigated under six constant temperatures（18, 21, 24, 27, 30, 33℃） in this study. The results showed that the developmental durations of egg and larva declined and the growth rate accelerated along with the increase of temperature. The threshold temperatures for development of egg, larva, pupa, pre-oviposition of adult and generation of D.rybakowi were（10.4±0.8）（12.2±0.7）（8.7±0.9）（16.4±0.8）℃ and（8.6±0.9）℃, respectively, and the effective accumulated temperatures were（97.9±4.8）（158.2±7.9）（212.1±11.5）（158.6±13.6） and（838.0±43.9） degree-days, respectively. The larval survival rate decreased at 18℃ and 33℃, and the adult emergence rate decreased significantly at 33℃, while the egg survival rate was higher than the larval survival rate. The optimum temperature（T）range for the growth, development and reproduction of D. rybakowi was 21℃＜T≤30℃.

To clarify the diversity and temporal dynamics of darkling beetles in Minqin temperate desert grassland， this study systematically investigated the communities of different subtypes of darkling beetles in gravelly， sandy， and saline desert grasslands in Minqin County， Gansu Province， from April to October 2021 using the pitfall trapping method. In this survey， 8492 individuals of 10 species in 8 genera were captured. The dominant species in the desert steppe in general were Microdera elegans and Sternoplax setosa setosa， which accounted for 26.88% and 25.07%， respectively， of the total individuals， whereas Eumylada potanini was an endemic species in gravelly desert grassland. The number of darkling beetles of their respective species in the three subtypes of desert grasslands peaked in July and dropped to the lowest level in October. The community abundance and Shannon–Wiener diversity index of the darkling beetles were significantly higher than those in saline desert grassland （P ＜ 0.05）， and the community richness of darkling beetles was significantly higher than that of sandy desert grassland （P ＜ 0.05）. The diversity of the darkling beetles was closely correlated with environmental factors: the community abundance index was significantly negatively correlated with the height of the vegetation community， soil water content， and vegetation cover （P ＜ 0.05）. The abundance index of the darkling beetles was significantly positively correlated with the plant Shannon–Wiener diversity index and plant richness （P ＜ 0.05）. The vegetation composition of the desert grassland is simple; therefore， the community composition of the darkling beetles is also simple. The plant diversity index and plant richness are higher in gravelly desert grasslands than in saline desert grasslands and sandy desert grasslands， so the darkling beetles are the most abundant in gravelly desert grasslands.

[目的]明确甘肃省民勤县不同亚类荒漠草地地上昆虫的优势类群及多样性,丰富中国荒漠区域生物多样性保护与持续利用的资料,也为发展和丰富群落生态学研究提供资料.[方法]本研究于2020年和2021年的5-8月,在民勤温性荒漠草地3个亚类草地上,利用网捕、灯诱及陷阱法进行了昆虫种类调查.[结果]共采集昆虫19267头,分属于10目,51科,110种,其中鞘翅目(Coleoptera)为第1大类群,共21科50种,占总种类数的45.45%;鳞翅目(Lepidoptera)为第二大类群,共8科34种,占调查总种数的30.91%.从昆虫在不同亚类草地上的分布来看,沙质荒漠草地上的昆虫9077头,共10目、40科、91种,占总调查个体数的 47.11%,其中鞘翅目为优势类群,占沙质荒漠草地昆虫总个体数的56.41%,其次是鳞翅目,占25.58%;砾质荒漠草地上的昆虫6651头,共7目、36科、71种,占总个体数的34.52%,其中鞘翅目个体数量占砾质荒漠草地昆虫总个体数的73.45%;盐土荒漠草地上的昆虫3539头,共6目、24科、55种,个体数量仅占总调查个体数的18.37%,优势类群为鞘翅目和鳞翅目.沙质荒漠草地昆虫的多样性指数、丰富度指数和均匀度指数最高,三个亚类草地间昆虫优势度指数无显著差异.除沙质荒漠草地和砾质荒漠草地的昆虫物种相似度表现为中等不相似外,其他草地间均表现为中等相似.[结论]砂质荒漠草地的昆虫物种最丰富,砾质草地次之,盐土草地昆虫物种多样性最低;鞘翅目昆虫为3个亚类草地的优势类群.

为探索围栏封育对河西走廊北部温性荒漠草原植被动态变化的影响,对甘肃省民勤县2007年封育的温性荒漠草原植被特征及产草量进行了调查分析.结果表明:封育7年后,持续封育对河西走廊北部温性荒漠草原的产草量、植被盖度、植被高度和植物种数无显著影响(P>0.05),并未呈现持续增加效果.鉴于民勤县生态条件较为严酷的自然现状,建议对其温性荒漠草原继续实行围栏封育.