Zhao L.,Key Laboratory of Ecological Agriculture of the Ministry of Agriculture |
Zhao L.,Institute of Agricultural science of Yongchun County |
Luo S.,Key Laboratory of Ecological Agriculture of the Ministry of Agriculture |
Luo S.,Rural Environment of Guangdong Regular Higher Education Institutions |
And 8 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2011
There has been an increase in the use of other herbicides for both agricultural and non-agricultural purposes. The use of herbicides in China also has increased faster than that of insecticides and fungicides since last 30 years. The new technique of rice seedling-broadcasting with no-tillage (RSB-NT) is widely used and it was based on the applition of herbicides. The increasing pollution of herbicides in soil and water has been of concerns. The effect of four herbicides including butachlor, bensulfuron-methyl, the mixture of bensulfuron and butachlor, potassium chlorate on typical aquatic animals (Pomacea canaliculata Spix, Tunnel snail) in rice paddy wetland were studied in laboratory. In the immersion experiment, both of the aquatic animals divided into four groups with three concentrations. The results showed that the metabolism of them was affected by these herbicides. The respirations of those two aquatic animals were little affected by potassium chlorate and bensulfuron-methyl, but the respirations of them were significantly inhibited by butachlor and the mixture of bensulfuron and butachlor. Butachlor and the mixture of bensulfuron and butachlor have more infection than potassium chlorate and bensulfuron-methyl to the livability of them. The results also indicated that the NH4 -N, phosphor, and total nitrogen in water with the aquatic animals were affected by these herbicides. Butachlor and the mixture of bensulfuron and butachlor have more influence on excretion rate and phosphor excretion rate of Pomacea canaliculata and Tunnel snail were significantly affected by these four herbicides. In conclusion, the results demonstrated that the best choice for herbicides in rice paddy was the mix of bensulfuron and butachlor, the second was bensulfuron-methyl, the third was butachlor and the last was potassium chlorate according to the impacts of herbicides to the typical aquatic organisms in rice wetland.
Zhao B.,South China Agricultural University |
Zhao B.,Key Laboratory of Ecological Agriculture of Ministry of Agriculture |
Zhao B.,Rural Environment of Guangdong Regular Higher Education Institutions |
Zhang J.,South China Agricultural University |
And 5 more authors.
Plant, Soil and Environment | Year: 2013
This study aimed to know whether the methane oxidation of rice roots was enhanced when rice shoots was stimulated. Stimulus was applied using a mechanical device which continuously touched the rice shoots with strength of 5, 30 and 60 min/day. In 5 min/day and 30 min/day stimuli treatments, methane oxidation rates of rice roots at 6 h were both significantly improved. Rice height was decreased significantly in 30 min/day stimuli treatment. Root biomass and root activities were significantly improved in 5 min/day and 30 min/day stimuli treatments. Length, surface area and volume of rice roots in 30 min/day stimuli treatment were improved significantly. Stomata areas were found to be significantly higher in 30 min/day and 60 min/day stimuli treatments. Continuous stimuli of 5 min/day and 30 min/day on rice shoots led to methane oxidation capacity enhancement of rice roots and response of rice at the physiological and morphological level. This study ascertained the importance of biological activity in paddy fields on the methane release process.