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以国家灰漠土土壤肥力与肥料效益长期监测站为平台,采用蒋柏藩-顾益初土壤无机磷分组方法,对23年长期定位施肥条件下、不同施肥处理土壤无机磷总量(IOP)及组分(Ca_2-P、Ca_8-P、Al-P、Fe-P、O-P、Ca_(10)-P)进行测定,以掌握长期施肥对干旱区灰漠土无机磷组分的影响规律并指导合理施肥。结果表明,长期不施肥(CK)处理土壤无机磷总量无显著变化,组分间主要发生Ca_2-P、Ca_8-P向Ca_(10)-P的转化;长期施肥(NPK、NPKM、NPKS)处理IOP极显著增加,其增加量主要为Ca_2-P、Ca_8-P、Al-P和Fe-P,其中前三者增加作用极为显著;长期施肥条件下,土壤无机磷组分中Ca_8-P转化率最高、占土壤无机磷转化总量的39%~50%,其次是Al-P、占16%~30%,再次是Ca_2-P、占10%~29%,三者合计占78%~88%,其余三种组分Fe-P、O-P、Ca_(10)-P占12%~22%。
Based on the platform of Long-term Monitoring Station of Soil Fertility and Fertilizer Benefit of National Gray Desert Soil, the soil inorganic phosphorus grouping method of Jiang Baofan-Gu Yishu was used to study the effects of different fertilization treatments on the total inorganic phosphorus (IOP) Ca2-P, Ca-8-P, Al-P, Fe-P, OP and Ca 10 -P were measured to understand the effect of long-term fertilization on inorganic phosphorus in arid desert soil and to guide the rational fertilization. The results showed that there was no significant change in the content of total inorganic phosphorus in long-term no-fertilization (CK), Ca2-P and Ca_8-P conversion to Ca_ (10) The content of Ca (superscript 2 -) P, Ca (superscript 2 +), Al (superscript -) P and Fe-P in treatment IOP was significantly increased. The highest conversion rate, accounting for 39% ~ 50% of total inorganic phosphorus conversion in soil, followed by Al-P, accounting for 16% -30%, again Ca_2-P, accounting for 10% -29% ~ 88%, the other three components Fe-P, OP, Ca_ (10) -P accounted for 12% to 22%.