摘要
从1988年开始，进行沿海滩涂盐土大面积以囤蓄雨水为主、回龙水灌溉为辅的养鱼改良强度盐渍化土的试验，当其含盐量降至一定的数值后，脱盐速率明显下降[1,2]。在此基础上，从1990年开始，又建立了麦鱼套作新的种养殖模式，并与其它中度以下盐渍土单纯种植大麦的传统种植制度和目前的大面积蓄淡养鱼改土的利用方式进行比较试验。三年的试验结果表明：1．滨海中度盐渍化土以麦鱼套作模式脱盐最快，Na+／Ca2下降幅度最大，0～20cmCa2+富集明显。2.土壤性质的改善亦是麦鱼套作最为理想：0～20cm土壤容重减小、孔隙度和土壤速效磷增加以麦鱼套作最明显；有机碳增幅为传统单种大麦的1.48倍，土壤供氮强度因素亦表现为麦鱼套作＞大麦单作＞蓄淡养鱼；同时麦鱼套作试验土壤脲酶活性最高，而该酶活性与滨海盐土肥力因素之间显示了较好的相关性。
A strongly salined coastal soil was reclaimed by fish culture with accurnulated rain water together with additional irrigation using slightly salined river water. The rate of salt leaching was distinctly decreased after the salt contents of the soils declined to certain values. Two years later, in the same soils, a new culture model of mixed cultUre of fish and bariey (MC)1) was set up and compared with only bariey culture (BC)2) and with only fish cultUre (FC)3) to exame the effect of saline soil reclamation.The results obtalned in the following three years were as follows. 1. The maximum rate of salt leaching, the biggest decrease of Na+ / Ca+ + and the dishnct enrichment of Ca+ + in surface soil (0~ 20cm) were obtained in the soils of MC. 2. Better soil fenility indexes, such as soil physical and chendcal properties, could also be found in the soils of MC. Thus, soil organic carbon of MC was 1.48 hmes that of BC, the ability of nitrogen supply was in the order of MC > BC > FC, and the biggest achvity of soil urease was obtained in the soil of MC, which was closely related to the fertility of coastal saline soil.
出处
《土壤学报》
CAS
CSCD
北大核心
1997年第3期315-322,共8页
Acta Pedologica Sinica
关键词
改良滨海盐土
大麦
鱼
套作
Mixed culture of fish and barley, Reclamation of coastal saline soil
