Our main purpose here was to visit the historic Western Xia Black City and poplar natural reservation area and take photos of them.
我们到此主要是参观和拍摄历史悠久的西夏黑城和胡杨自然保护区。
2
Experiment on poplar seedling cultivation with black film covering demonstrated that it could improve greatly quality of the seedling and reduce the cost.
采用黑膜覆盖进行杨树扦插育苗试验，结果表明，黑膜覆盖能够明显提高苗木质量，显著降低育苗成本。
3
A report is made of the study of chemical components of the odor with luring activity from withered blackpoplar leaves.