国家自然科学基金81770525;甘肃省青年科技基金计划17JR5RA233,18JR3RA332;甘肃省自然科学基金17JR5RA191National Natural Science Foundation of China81770525;Youth Science and Technology Fund Project of Gansu Province17JR5RA233,18JR3RA332;Natural Science Foundation of Gansu Province17JR5RA191