80 Anerewandte Botanik 



&^ 



Arens, P., Die Verwendung von Tephrosia Fb^^/zV als Grün- 

 dünger und Windbrecher auf Java. (Intern, agrar-techn, 

 Rundschau. VI. 7. p. 1024. 1915.) 



Die Pflanze hat für Kaffeeplantagen einen grossen Wert, wenn 

 sie auch oft von Heierodera befallen wird, da dieser Wurm die 

 Kaffeepflanze nicht befällt. Aber dort, wo der Chinabaum, Tee oder 

 Tabak gepflanzt werden, ist grösste Vorsicht geboten, da diese 

 Kulturpflanzen von der Heterodera leichter befallen werden. 



Matouschek (Wien). 



Brenchley, W. E. and H. Adam. Recolon isa tion of culti- 

 vated land allowed to revert to natural conditions. 

 (Journ. Ecol. III. p. 193—210. 1915.) 



Two areas of cultivated land at Rothamsted have been left 

 alone and allowed to revert to natural conditions since 1882 and 

 1885, and are now known as Broadbalk and Geescroft Wildernesses 

 respectively. The soil is heavy in both places, but whereas Broad- 

 balk is comparatively well drained, with the soil containing about 

 30/0 calcium carbonate, Geescroft is waterlogged during the greater 

 part of the year, and the soil only contains about 0,0050/0 calcium 

 carbonate, so that it is slightly acid. Notes on the flora have been 

 made at irregulär intervals for the last thirty years, and since 1913 

 monthly or fortnightly observations have been taken and correlated. 

 The lists of the flora are tabulated and compared, the relative fre- 

 quency of the species being given whenever possible. 



Broadbalk wilderness tends to revert to a woodland type, so 

 that at intervals the trees and shrubs have been grubbed up from 

 one half, the other part being left to form a thicket, which shows 

 the characteristic Vegetation of an oak-hazel wood. The grubbed 

 half is somewhat of the dry meadow type, with dominant species 

 that Vary from time to time. The Vegetation on Broadbalk wilder- 

 ness is apparently in a State of flux, but as a new factor has been 

 recently introduced owing to the abnormal spread of ivy over a 

 great part of the ground, it is impossible to foresee what change 

 will occur in the future. 



Geescroft Vegetation reflects the dampness of the soil by the 

 presence of great quantities of Aira caespitosa, with other damp- 

 loving species such as Phalaris arundinacea and Cirsium palustre. 

 The greater part of the area is a mass of Ana, but now one end 

 of the wilderness is drying out a little and a greater variety of 

 species are creeping in. 



An interesting point in connection with both wildernesses is 

 the number of species that were weeds on the areas when they 

 were under arable cultivation, and that have survived to the pre- 

 sent day. 



Comparisons are drawn between the floras of the two wilder- 

 nesses, and the sequence of events throughout the j'^ear is traced. 



W. E. Brenchley. 



A.usgegeben : 18 .Juli l»l*i. 



Verlag von Gustav Fischer in Jena. 

 Buchdruckerei A. W. Sythofl in Leiden. 



