水旱
2.Basic situation of inundation and drought in Hunan province is introduced.The reasons for those disasters are analysed.At last,the author points out the measures to synthetically harness inundation and drought and exploit regional resources.
3.The occurrence of flood and drought disaster (FDD) is not a simple natural accident.
5.The paddy?upland system increased clay dispersion content and soil fertility.
6.The three QTLs, qPH1-1, qPH1-2 and qPH1-3 were detected under both upland and lowland condition, but it was not the case for other QTLs.
7.Great differences in CTD were observed in different cultivars under each treatment.
8.The regional FDD is based on the coupling of the regional natural disaster-making factors,and with the eco-environment deterioration caused by the increase of the population and economy as its key factor.
9.The results showed: Xiaojian17,Xiaojian2-1258, Xiaojian7,Xiaojian13,1533,15-3-106 and 1547 adapted both in humid and arid regions,and they were high and stable yield varieties.
10.The results showed that the difference in the SOC contents at any two land-use types was highly significant(P < 0.01) and the SOC contents order was: double cropping paddy field(28.12 g/kg) > single cropping paddy field(27.03 g/kg) > flood drought rotation land(24.79 g/kg) > dry-land(17.96 g/kg).
