[Effects of different light transmission rate on American ginseng's photosynthesis].

From 1997 to 1998, series of experiments were carried out to study American ginseng's photosynthesis related to light transmission rate of plastic cover. The results showed that American ginseng's light saturation point for photosynthesis was different under the different light transmission rate (LTR) because of shading. At about 29.

[Microclimatic effect and soil moisture change of poplar-wheat intercropping systems in Huaibei Plain].

In this paper, the microclimatic effect and the soil moisture of poplar-wheat intercropping systems were studied. The results indicated that the strip intercropping, comparing with the contrast, could increase the relative humidity by 2-8%, decrease the surface temperature by 1-7 degrees C, and reduce wind speed. The illumination hours were decreased with the time and the distance between the rows, and the varying range was within 4.