Responses Of Reproductive Phenology Of Inner Mongolia Typical Steppe Plants Under Climatic Change And Artificial Interference

This study discussed the responses of reproductive phenology of Inner Mongolia typical Steppe plants under climatic change and artificial interference, using the platform with multi-factor experiments on global changes in Inner Mongolia Duolun. With the method of simulating the warming (infrared warming), changes in precipitation patterns (spring and summer raining), grazing (clipping) and fertilization interference (N or P fertilizer), we did the research focusing on different reproductive phenology changes rules of 11 common plants of Inner Mongolia Grassland, the results in 2006 showed that:Warming significantly advanced the flowering and fruiting time of Astraglus galactites, shorted reproductive stage of Astragalus scaberrimus, but prolonged that of Androsace longifolia.Raining (spring-raining and summer-raining) affected the flowering and fruiting time of all the species without significant difference, but affected the reproductive duration of Heteropappus altaicus with significant difference.Clipping significantly advanced the flowering time of Artemisia frigida, delayed the fruiting time of Potentilla acaulis and Allium bidentaum, prolonged the reproductive duration of Heteropappus altaicus.Fertilization treatment: N fertilizer significantly advanced the flowering and fruiting time of Stipa krylovii, prolonged the reproductive duration of Artemisia cristatum; P fertilizer had the same effects as N fertilizer on Stipa krylovii, but delayed the fruiting time of Artemisia cristatum with no effect on the reproductive duration. NP compost significantly advanced the flowering time of Stipa krylovii, Artemisia cristatum and Agropyron cristatum, and advanced the fruiting time of Stipa krylovii, delayed the fruiting time of Allium bidentaum, Astragalus scaberrimus and Cleistogenes squarrossa, prolonged the reproductive duration of Artemisia cristatum and Cleistogenes squarrossa.The interaction of warming and raining significantly advanced the fruiting time and prolonged the reproductive duration of Artemisia cristatum but with on effect on the flowering time.The interaction of fertilizing and raining significantly advanced the flowering time of Stipa krylovii, Artemisia cristatum and Cleistogenes squarrossa and delayed the flowering time of Astraglus galactites; advanced the fruiting time of Stipa krylovii, Allium bidentaum and Potentilla acaulis, prolonged the reproductive duration of Astraglus galactites, shorted Artemisia cristatum, Androsace scaberrimus and Astragalus scaberrumus.The interaction of clipping and watering significantly delayed the flowering time of Agropyron cristatum, but advanced the fruiting time of Stipa krylovii.The interaction of clipping and fertilizing significantly advanced the flowering time of Artemisia frigida, delayed Astragalus galactites; advanced the fruiting time of Stipa krylovii; significantly prolonged the reproductive duration of Astragalus galactites and Androsace longifolia, shorted Artemisia cristatum, Androsace scaberrimus.The interaction of Clipping, fertilizing and watering significantly advanced the flowering and fruiting time of the Stipa krylovii, delayed the fruiting time of the Potentilla tanacetifolia, prolonged the reproductive duration of Androsace longifolia and Heteropappus altaicus.