摘要
研究了沿黄盐碱地池塘水（ＣｌⅡＮａ 和ＣｌⅢＮａ） 的主要营养盐（Ｎ、Ｐ） 的限制作用和适宜施肥浓度。首次发现该类型池塘普遍表现为氮限制。塘水中无机氮浓度很低，只有（２３ ．５６ ±１２ ．５３） μｇ／Ｌ（ Ｍ±ＳＤ） ，与无机磷的比值仅为１ ．０２ ±０ ．８５ ；而总氮和总磷并不低，分别为（３ ．３５ ±１ ．０８） ｍｇ／Ｌ 和（０ ．２４ ±０ ．１１） ｍｇ／Ｌ；ＴＮ／ＴＰ为１４ ．９４ ±３ ．４３ 。适宜的施肥Ｎ∶Ｐ（ 重量） 为（１０ ～１５）∶１ 。文中提出了１ 种氮限制指数：ＩＮＬ＝ （ＤＯＩＮ１ ．０－ ＤＯＩｃ）／（ＤＯＩＮ１ ．０Ｐ０ ．１ － ＤＯＩｃ） ，并拟合出ＩＮＬ 与ＴＮ／ＴＰ的相关模型，ＩＮＬ 可准确地表示氮限制程度。文章最后分析了氮限制的原因。
With the oxygen evolution bioassay method, the studies on nutrient (N,P)limitation and optimum N∶P ratio for fertilization of 13 ponds (Cl Ⅱ Na and Cl Ⅲ Na in saline-alkaline land were conducted,and the concentrations of nutrients were measured at the same time.The phenomenon was discovered for the first time that this kind of ponds generally showed N limitation. The concentration of inorganic nitrogen (TN) in pond water was very low,only(23.56±12.53)μg/L(mean±SD),and the TN/TP was only 1.02±0.85.But the total nitrogen and total phosphorus were not low,which were (3.35±1.08)mg/L and (242.16 ±108.70)μg/L,respectively.The TN/TP was 14.94±3.43.The optimum N∶P( by weight) for fertilization was (10～15):1.A kind of index of N limitation,INL=(DOI N1.0 -DOI c)/(DOI N1.0P0.1 -DOI c),which could well express the extent of N limitation,was suggested,and a model was developed to simulate the relationship between INL and TN/TP.At last,the reasons for N limitation were analyzed.
出处
《中国水产科学》
CAS
CSCD
1999年第4期43-48,共6页
Journal of Fishery Sciences of China
基金
国家杰出青年科学基金!(39725023)
国家"九五攻关"项目!(96080401)
关键词
盐碱池塘
氯化物水型
营养盐
施肥
saline-alkaline pond, Cl Ⅱ Na and Cl Ⅲ Na water, nutritive salts, fertilizing
