[Correlations between content of linarin in Chrysanthemum indicum and climatic factors in habitats].

Chrysanthemi Indici Flos(CIF), the capitulum of Chrysanthemum indicum, is widely used in proprietary Chinese medicine and daily chemical products. At present, CIF is mainly produced from wild resources and rarely cultivated. This study aims to reveal the correlations between linarin content in CIF and climatic factors in different habitats, and provide a theoretical basis for suitable zoning and rational production of medicinal materials. The content of linarin in CIF was determined by HPLC. Grey relational analysis and Pearson correlation analysis were carried out for linarin content with climatic factors. The results showed that the content of linarin in CIF was significantly different among different habitats. The grey relational degrees of climatic factors with linarin content was in an order of average annual precipitation>annual average sunshine hours>annual average temperature>longitude>annual frost-free period>latitude>altitude. Longitude, annual average temperature and average annual precipitation had significantly positive correlations with the content of linarin in CIF, whereas latitude and altitude showed negative correlations with it. The annual frost-free period and annual average sunshine hours had no significant correlation with the content of linarin in CIF. The content of linarin in CIF varied significantly in different habitats. High longitude, low latitude, low altitude, high annual average temperature and high annual average precipitation could be used as indicators for the habitats of high-quality Ch. indicum. This study provides a reference for selecting suitable producing areas of Ch. indicum and establishing artificial cultivation system.

[Leaf C:N:P stoichiometry of 67 plant species and its relations with climate factors across the deserts in Xinjiang, China.] / 新疆67ç§è’æ¼ æ¤ç‰©å¶ç¢³æ°®ç£·è®¡é‡ç‰¹å¾åŠå ¶ä¸Žæ°”å€™çš„å ³ç³».

Desert ecosystem has unique drought-enduring plants and stoichiometric characteristics. We collected leaf samples of 67 plant species from 63 desert sites in Xinjiang, and explored foliar carbon (C), nitrogen (N) and phosphorus (P) stoichiometry and the relationship between leaf nutrient stoichiometry and climatic factors. The results showed that the average content of leaf C, N and P in these plants were 394, 18.4 and 1.14 mg·g-1, respectively. The mean values of C:N, C:P and N:P were 28, 419 and 18, respectively. In general, shrubs had higher leaf N content than trees and herbs, while leaf P content was lower (higher) in shrubs than in herbaceous plants (trees). Plants with C3 photosynthesis pathway had higher leaf C, N, C:P and N:P than those with C4 pathway. With increasing mean annual precipitation, leaf C first decreased and then increased, while both leaf N and P showed the opposite trend. Leaf C:N and C:P first decreased and then increased, while leaf N:P changed insignificantly. With increasing mean annual temperature, leaf C first decreased and then increased, and leaf N and P decreased, while leaf C:P and N:P increased. Leaf C:N did not change significantly with mean annual temperature. Mean annual precipitation generally showed stronger control on the variation of leaf nutrient stoichiometry than MAT and plant functional types. These results could help predict responses of the biogeochemical cycling of C, N and P to the global climate changes and provide reference and basic data for biogeochemical modeling in the arid regions.

[Response of volatiles of Artemisiae Argyi Folium to climatic factors].

Combined headspace solid-phase microextraction with gas chromatography-mass spectrometry (HS-SPME-GC-MS), this paper studied the volatiles of Artemisiae Argyi Folium that respectively collected from Kongdong, Huanglong, Ankang, Qichun and Tongbai，and then explored the influence of climatic factors on the main components of the volatiles. The results showed that 54, 52, 57, 47 and 55 compounds were respectively identified from the leaves from five regions, mainly consist of monoterpenes, sesquiterpenoids and their oxygen-containing derivatives, a few aldehydes, alkanes and benzenes. It is different that the volatiles of Artemisiae Argyi Folium that collected in different habitats, neither composition nor content. There are total 18 kinds of compounds that exist in all five leaves. Eucalyptol, camphor, terpinen-4-ol, eugenol and caryophyllene could be considered to be the main conponents because of their efficacy or toxicity and relatively high content. Grey correlation analysis shows that the annual lowest temperature and annual sunshine duration have a great influence on the content of eucalyptol and camphor; the effect of annual precipitation and annual accumulated temperature on the content of terpinen-4-ol and caryophyllene was relatively significant; while the annual sunshine duration and the annual highest temperature are the main influencing factors for eugenol. The research suggests that long-day and extreme temperature may be more conductive to the accumulation of volatiles. According to the laws of effect of climatic factors on volatiles, we can optimize the cultivation conditions and select suitable locality to improve the quality of Artemisiae Argyi Folium.