问题:土壤空气的特点包括()。A、CO2含量高B、O2含量低C、含还原性和毒性气体D、水汽经常饱和E、CO2含量低...
Tuesday, March 26, 2024
Friday, January 19, 2024
Thursday, August 24, 2023
Thursday, October 20, 2022
问题:在自然土壤中,可能出现的土壤剖面形态持征是()。...
Wednesday, September 14, 2022
Thursday, August 31, 2023
问题:什么是阳离子交换量?影响土壤阳离子交换量的因素有哪些?...
Monday, August 21, 2023
Tuesday, October 11, 2022
Monday, September 12, 2022
Wednesday, September 14, 2022
Wednesday, August 16, 2023
问题:外力作用的总的趋势是要削平大山和高原,并且将破坏它们所产生的物质,搬到低的地方堆积起来,以消弥地球表面高低崎岖的地形。...
Sunday, January 14, 2024
Wednesday, September 14, 2022
Wednesday, September 14, 2022
Sunday, January 14, 2024
Sunday, February 18, 2024
Friday, September 22, 2023
Tuesday, February 7, 2023
问题:各类森林土壤由于处在不同的生物气候带,从北至南,森林土壤表层有机质含量变化曲线大致呈“∨”形(黄壤例外)。...
Sunday, January 14, 2024