1) δ 13 C in tree rings
年轮δ13C
2) Tree ring stable carbon isotope
树轮δ13C
3) δ13C value
δ13C值
1.
In this study,by measuring stable carbon isotopes in leaves of 51 alpine plant species belonged to 19 families and 41 genera growing in the east of Tibetan Plateau in 2002 and 2003,we studied the variations of δ13C values between two year.
文章通过分析2002年和2003年青藏高原东部青海省门源县境内隶属于19科41属51种植物叶片的δ13C值,研究高寒草甸植物稳定碳同位素组成的年间变化及其与环境因子的关系,分析影响δ13C值变化的关键因子。
2.
Four long-term agricultural field experiments combined with an laboratory incubation experiment were conducted to evaluate the effect of organic,inorganic and organic+inorganic fertilizer application on δ13C value of soil organic matter(SOM)and humic acid(HA)in black soil,brown soil,meadow soil and paddy soil.
以黑土、棕壤、草甸土和水稻土为供试土壤,通过田间定位并结合室内培养试验,初步研究了不同施肥(包括施用化肥、有机肥以及有机肥配施化肥)条件下全土有机质和胡敏酸的δ13C值。
3.
The foliar δ13C values were used to denote the long-term water use efficiency(WUE)of plants whereas long-term nitrogen use efficiency(NUE)was estimated by the ratio of C to N.
对长汀水土流失区不同生态恢复程度生境马尾松(Pinus massoniana)与木荷(Schima superba)的叶片稳定碳同位素组成(δ13C)、比叶面积(specific leaf area,SLA)、叶N含量及C/N进行了分析,并以叶片δ13C值和C/N分别指示植物的水分利用效率(water use efficiency,WUE)和氮素利用效率(nitrogen use efficiency,NUE)。
4) tree ring
年轮
1.
The Research on the content of chemical element of Pinus massoniana’s tree ring in Liuzhou;
柳州酸雨区马尾松年轮元素含量变化研究
2.
Responses of Chinese pine tree ring in Shenyang suburb (Fu Mausoleum) to global temperature fluctuation;
沈阳福陵油松年轮对全球性气温波动的响应
3.
Segmental rectification of tree ring photogrammetry;
树木年轮照片测量的区段校正
5) Annual ring
年轮
1.
The characteristics of annual ring of Merremia boisiana (Gagn.
)的年轮特征,并探讨了它与温度等气候因子的关系。
2.
It was found that the new annual ring began to appear mostly from April to June.
月鳢鳞片可作为年龄鉴定的依据,其年轮形成时期在4～6月。
3.
Internal structural characteristics of wood can be detected non-destructively and the density can be measured accurately by CT technology, which is a new important way for timber industry as well as research on density variation of annual ring, and the growth characteristics of the trees.
CT技术能无损地获取木材的内部结构特征,同时也能较精确检测到木材密度,这为木材的加工及研究树木年轮间密度变异和树木生长规律提供了另一检测方法。
6) annulus
[英]['ænjuləs] [美]['ænjuləs]
年轮
1.
Based on marginal increment analysis, it was demonstrated that the annulus in otoliths was formed once in a year, and the formation periods were from April to June and March to May in Honghu Lake and Dongting Lake, respectively.
对耳石边缘年轮形成周期进行了分析。
补充资料：cis-Δ13:14-docosenoic acid
分子式： CH3(CH2)7CH:CH(CH2)11COOH
CAS号：
性质：又称顺(式)13-二十二碳烯酸。属脂肪酸类化合物。乙醇中针状结晶，熔点33.8℃。碘值74.98。相对密度0.860。沸点381.5℃(分解)。折射率1.4534。不溶于水，溶于乙醇、甲醇，易溶于乙醚。在自然界中存在于十字花科芸苔属植物白芥(Brassica alba)种子脂肪及菜子油中，含量颇高。有时也把α-羟-15-二十四碳烯酸。也包括在芥酸内。芥酸及其甘油酯可应用于食品工业或化妆品制造业。用于生产表面活性剂。
CAS号：
性质：又称顺(式)13-二十二碳烯酸。属脂肪酸类化合物。乙醇中针状结晶，熔点33.8℃。碘值74.98。相对密度0.860。沸点381.5℃(分解)。折射率1.4534。不溶于水，溶于乙醇、甲醇，易溶于乙醚。在自然界中存在于十字花科芸苔属植物白芥(Brassica alba)种子脂肪及菜子油中，含量颇高。有时也把α-羟-15-二十四碳烯酸。也包括在芥酸内。芥酸及其甘油酯可应用于食品工业或化妆品制造业。用于生产表面活性剂。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条