A report is made of the study of chemical components of the odor with luring activity from withered black poplar leaves.
采用水蒸气蒸馏法提取黑杨萎蔫叶片具诱虫活性的气味物质，用气相色谱质谱联用技术分离和鉴定活性物质的化学成分。
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。
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。
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。
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