土壤种 meaning in English

soil ecies
soil species

The algae multiplied massively in suitable environment , and made the amount of available phosphorus in soil increase significantly . the influence of the base matter on available phosphorus in soil was much more significant . in the second step , nostoc commune and chlamydomonas sajao lewin were inoculated of different inoculation quantities to the barren soils
实验是在贫瘠土壤种接种具有固氮能力的念珠藻(蓝藻类)和沙角衣藻(陆生绿藻) ，在0 . 1g 、 0 . 5g 、 1 . 0g 、 2 . 0g湿藻重500g土重的不同浓度梯度进行接种，进行常温下培养。