Response patters were investigated for seedlings of Hedysarum mongolicum, a dominant shrub in Maowusu sandland, to the simulated precipitation change by artificially controlling water supply at four levels. Plant ...Response patters were investigated for seedlings of Hedysarum mongolicum, a dominant shrub in Maowusu sandland, to the simulated precipitation change by artificially controlling water supply at four levels. Plant growth characters, in terms of branch number and length, leaf number and area, and biomass, increased while water supply increased. However, the effect of water supply on leaf photosynthetic rate was not significant. Root/shoot biomass ratio significantly decreased with the increase of water supply, which was considered adaptive distribution of biomass investments in the different water supply. Water supply obviously affected branching patter. Branch section number, branch number and length of the same section enhanced as water supply increased. Branch number and length were clearly positive correlation with total and aboveground biomass in four water supply treatments. Branch character fully showed plant growth.展开更多
The parasitism of Orgyia ericae,which causes damage to Ammopiptanthus mongolcus,Heclysarum mongolicum,Hedysarum scoparium and Caragana korshinskii was investigated in Hangjin Qi and Etuoke Qi of Erdosi in Inner Mongol...The parasitism of Orgyia ericae,which causes damage to Ammopiptanthus mongolcus,Heclysarum mongolicum,Hedysarum scoparium and Caragana korshinskii was investigated in Hangjin Qi and Etuoke Qi of Erdosi in Inner Mongolia.The results showed that 8 insect species of the natural enemy were found to parasitize the O.ericae,including Tetrastichus sp.at egg stage,Pimpla disparis、Itoplectis viduata and Aprostocetus sp.at pupa stage,Monodontomerus minor and Aprostocetus sp.at larva-pupa stage,Exorista larvarum and one species of Apanteles spp.at larva stage.Among them the ichneumon flies and chalcids were found sometimes to parasitically co-live in a pupa.There was significant difference in parasitism rate on H.mongolicum between the two regions in the same stage,and was also significant difference over the different stage in the same regions and hosts.展开更多
文摘Response patters were investigated for seedlings of Hedysarum mongolicum, a dominant shrub in Maowusu sandland, to the simulated precipitation change by artificially controlling water supply at four levels. Plant growth characters, in terms of branch number and length, leaf number and area, and biomass, increased while water supply increased. However, the effect of water supply on leaf photosynthetic rate was not significant. Root/shoot biomass ratio significantly decreased with the increase of water supply, which was considered adaptive distribution of biomass investments in the different water supply. Water supply obviously affected branching patter. Branch section number, branch number and length of the same section enhanced as water supply increased. Branch number and length were clearly positive correlation with total and aboveground biomass in four water supply treatments. Branch character fully showed plant growth.
文摘The parasitism of Orgyia ericae,which causes damage to Ammopiptanthus mongolcus,Heclysarum mongolicum,Hedysarum scoparium and Caragana korshinskii was investigated in Hangjin Qi and Etuoke Qi of Erdosi in Inner Mongolia.The results showed that 8 insect species of the natural enemy were found to parasitize the O.ericae,including Tetrastichus sp.at egg stage,Pimpla disparis、Itoplectis viduata and Aprostocetus sp.at pupa stage,Monodontomerus minor and Aprostocetus sp.at larva-pupa stage,Exorista larvarum and one species of Apanteles spp.at larva stage.Among them the ichneumon flies and chalcids were found sometimes to parasitically co-live in a pupa.There was significant difference in parasitism rate on H.mongolicum between the two regions in the same stage,and was also significant difference over the different stage in the same regions and hosts.
